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Technical Description - Physics

Thermo Fisher Scientific

SAM12 User Manual 6-11

free space, (i.e. un-attenuated). The detectors were optimised
for each Isotope in the geometric centre of the measurement
cubicle.
Efficiencies are quoted “Centre” (geometric centre of
Measurement Volume).
and

3 inches (centre of Measurement Volume 3”
from floor)

Nominal Value quoted with maximum spread in brackets.
Door configuration has a small, usually insignificant, effect on
6 detector efficiencies.

Table 1 Standard SAM12 Standard Stainless Steel Liners

Variant

Total
Bgnd
(typ)

60

Co (1.2

MeV)

137

Cs (662

keV)

137

Ba (356

keV)

10

μ

R/h

0.1

μ

Sv/h

3 inches

Centre

3 inches

Centre

3 inches

Centre

4C-XD-
1L

350 cps

45%

(40-
48)

40%

(36-
44)

17%

(16-
20)

16%

(15-
19)

28%

(26-
31)

26%

(24-
28)

6C-2D-
1L

550 cps

57%

(55-
59)

53%

(51-
55)

24%

(22-
26)

23%

(21-
25)

38%

(36-
40)

36%

(34-
38)

6C-1D-
2L

350 cps

61%

(58-
65)

58%

(56-
60)

26%

(24-
28)

25%

(23-
27)

—

—

Low Energy Variants have 6 detectors, 2 inches (50 mm) lead
shielding and an additional 2mm Copper X-ray absorber.
(

Note

: mu-metal magnetic shielding is removed for maximum

sensitivity).

Table 2 Low Variant SAM12 Energy Variants

Total

Bgnd

241

Am (59 keV)

3 inches

Centre

SAM12LP – 6C-1D-2L
(Plastic Liners)

1000 cps

13½%
(12-15)

13%
(12-15)

SAM12LA – 6C-1D-2L
(Aluminium Liners)

1000 cps

9%

9%

SAM12A – Standard

Stainless Steel Liners

Low Energy Variants

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Содержание SAM12

Страница 1: ...MANUAL SAM12 SMALL ARTICLES MONITOR Thermo Fisher Scientific SAM12 21st September 2007...

Страница 2: ......

Страница 3: ...IENTIFIC AND IS SUPPLIED FOR USE ONLY IN CONNECTION WITH THE OPERATION AND OR MAINTENANCE OF THE EQUIPMENT TO WHICH IT RELATES AS SUPPLIED BY THERMO FISHER SCIENTIFIC THE CONTENTS MUST NOT BE USED FOR...

Страница 4: ...This manual was produced using ComponentOne Doc To Help...

Страница 5: ...aining batteries This is due to the presence of naturally occurring radioactive materials in some batteries probably Thorium To avoid operational difficulties it is therefore recommended that batterie...

Страница 6: ...ained in this manual or for incidental special or consequential damages arising out of the furnishing of this manual or the use of this manual in operating the equipment or in connection with the perf...

Страница 7: ...than four pounds may influence the accuracy of the monitor In standard mode the monitor is unable to differentiate between pre existing activity and surface contamination of an article The NBR feature...

Страница 8: ...689A Electronics Housing CAUTION Isolate the mains supply and wait one minute before removing this cover As seen on the FHT681 HV Amplifier board screen located inside the 5689A Electronics Housing CA...

Страница 9: ...Fisher Scientific has contracted with one or more recycling disposal companies in each EU Member State and this product should be disposed of or recycled through them Further information on Thermo Fi...

Страница 10: ......

Страница 11: ...5672A 2 4 Chapter 3 Specification 3 1 Operational Parameters 3 2 Software Options 3 2 Vault Options 3 2 Default Messages 3 2 Background Capability 3 2 Detectors 3 3 Four or Six Detectors 3 3 Detector...

Страница 12: ...roduction 6 1 Spatial Response 6 2 Explanation of the Operational Calculations 6 2 Introduction 6 2 Description of Parameters Used in Calculations 6 2 Background Update 6 5 Changing Background 6 5 Cal...

Страница 13: ...Routine Checks 8 1 Mechanical Checks 8 1 Door Locking Mechanism if fitted 8 1 SAM12 Mounting Arrangement 8 1 Other Mechanical Checks 8 1 Electrical Checks 8 2 Battery Charge state 8 2 Display Checks...

Страница 14: ...val 11 9 Detector Replacement 11 9 Setting up Replacement Detectors for Use 11 9 Door Lubrication 11 10 Door Catch and Lock Replacement and Adjustment 11 10 Replacement and Adjustment of Chrome Lever...

Страница 15: ...ientific SAM12 User Manual xiii Tables Table 1 Standard SAM12 Standard Stainless Steel Liners 6 11 Table 2 Low Variant SAM12 Energy Variants 6 11 Table 3 Probability Sigma and 6 12 Table 4 Summary of...

Страница 16: ...Top SAM12A 4C 2D 1L 6 15 Figure 5 Efficiency Variation along Central Axis Left to Right SAM12A 4C 2D 1L 6 15 Figure 6 Front Spatial Response SAM12A 6C 1D 2L 6 16 Figure 7 Side Spatial Response SAM12A...

Страница 17: ...c SAM12 User Manual xv Manual Revision History Issue Date Name Section s Revision comments Approval 1 0 Draft 14 09 07 C Hills All Draft release of SAM12 User Manual for review M Pottinger 1 0 21 09 0...

Страница 18: ......

Страница 19: ...ining all lower order passwords The HP would normally be responsible for installing and setting up the SAM12 calibrating for user defined nuclides programming operating parameters and verifying correc...

Страница 20: ......

Страница 21: ...ve volume Each detector has a separate independently adjustable High Voltage HV supply Five discriminators are available per detector This provides adjustable windows for measuring different energy le...

Страница 22: ...o lock after alarms if required The standard SAM12 can have the following options in any combination 4 or 6 Scintillation Counters C 1 or 2 Doors D 1 25mm or 2 50mm Lead L The instrument build standar...

Страница 23: ...urther stainless steel liner covers the lead on the inside of the doors The outside of the cabinet is clad with stainless steel in fill panels The whole cabinet stands on two box sections mounted one...

Страница 24: ...real time clock The motherboard interfaces directly to all other boards and external devices in the system via numerous connectors not all are being used The application software is retrieved from a...

Страница 25: ...discharged even when mains power is absent The key switch needs to be held ON for at least two seconds before the ON state is engaged The 5660A continues to monitor the terminal voltage of the battery...

Страница 26: ...coincidence on any two detectors can be registered This allows measurements on Cobalt 60 FHT681 Coincidence Detector Card Type 42543 0224 The card can support coincidence from 6 detectors via the dig...

Страница 27: ...SAM12A 4C 1D 2L SAM12A 4C 2D 1L SAM12A 4C 2D 2L SAM12A 6C 1D 1L SAM12A 6C 1D 2L SAM12A 6C 2D 1L SAM12A 6C 2D 2L A Low energy Plastic liner LP version is available for detecting low energy gammas inclu...

Страница 28: ...evel the energy window can be changed to lower the background count rate thus allowing greater statistical certainty see Hv Power page 5 28 and Selection of Detector Operating Parameters page 9 3 The...

Страница 29: ...expectedly or persists The lower the background field the more sensitive stable and accurate the measurements will be Detectors Type 5569A Construction Large area scintillation counter using a plastic...

Страница 30: ...from the clean door Data entry and diagnostic functions are accessed through a touch screen but access is password protected Displays The integral back lit LCD display provided is used in conjunction...

Страница 31: ...ory sticks dongles keyboard mouse etc Printers A dot matrix printer is available as an option A0210A Contact Thermo Fisher Scientific for the latest model Power Requirements Voltage 85 to 264 volts AC...

Страница 32: ...TORE ABOVE 60 C 122 F Internal fields from measured items Standard SAM12 A variants Internal magnetic shielding ensures magnetic fields of up to 9000 A m measured on the surface of the liner will have...

Страница 33: ...mo Fisher Scientific SAM12 User Manual 3 7 IP50 Not for use in flammable or explosive atmospheres For installation in drip free locations only Do not expose to excessive dust pollution levels IP ratin...

Страница 34: ......

Страница 35: ...AM12 PARTICULAR CARE SHOULD BE TAKEN ON GRADIENTS ENSURE THE INSTALLATION SITE IS SUITABLY ROBUST DO NOT ATTEMPT TO OPEN DOORS UNTIL THE TRANSIT SUPPORTS HAVE BEEN REMOVED see Removing Door Transit Su...

Страница 36: ...oden base using the fork lifting channels provided CARE MUST BE TAKEN WHEN LIFTING THE SAM12 WEIGHS 1 5 TONS Mechanical installation is described below Mechanical Installation WARNING DO NOT ATTEMPT T...

Страница 37: ...remove the door transit supports when the SAM12 is physically installed to avoid fork lift shock damage The SAM12 is shipped with a Transit Support located on the underside of each door The Transit Su...

Страница 38: ...hanism If any adjustment is necessary refer to Replacement and Adjustment of Chrome Lever Catch page 11 10 after the Electrical Installation page 4 5 is complete NOTE The doors are a fabricated and we...

Страница 39: ...THE REAR PANEL IS SET TO THE OFF POSITION A standard IEC mains connector is fitted on the side panel specified to IEC 320 EN60320 Only mating connectors of the SAM12 standard should be used The SAM12...

Страница 40: ...the SAM12 make it very sensitive to changes in background Therefore it is recommended that the installation site be chosen for background stability and to minimise the effect of statistical fluctuati...

Страница 41: ...Note that communications with the SAM12 is via a touchscreen and this manual has been written primarily giving instructions for the touchscreen commands It is also possible to use a USB keyboard and...

Страница 42: ...ed in red When touching the screen in an alpha numerical field the following keyboard appears When touching the screen in a pre defined field the following window appears When touching the screen in a...

Страница 43: ...one option automatically clears the others The black dot shows the selected option Note that changes made to fields are highlighted until applied or cancelled Administration mode is entered by pressin...

Страница 44: ...ct OK to enter the Administration Mode note that the Diagnostics Detector Bar window is initially displayed The various options available in the Administration Mode are displayed in Menu Roles page 5...

Страница 45: ...t Technician Thermo Fisher Set Up Options 5 6 Params1 5 8 Params2 5 10 Params3 5 11 Alarms 5 12 Doors 5 13 Battery 5 14 Messages 5 15 Diagnostics Detectors Bar 5 16 Information 5 16 Timed Counts 5 17...

Страница 46: ...he Exit Application button A warning message is displayed asking for confirmation Select OK to exit and Cancel to abandon the exit process For further information see Actions page 5 40 Upon exiting fr...

Страница 47: ...en your SAM12 is not configured to use Cobalt Coincidence Monitoring If you require this utility please contact Thermo Fisher Scientific for further information This option toggles the CCM menu on off...

Страница 48: ...ntamination Checks see Residual Contamination Check page 5 59 Residual Contamination Check before Background Check Tick this option to enable a Residual Contamination Check to be automatically perform...

Страница 49: ...Default 7 Changing Conditions This statistical variable is used by SAM12 to determine if a changing measurement condition exists Values 0 1 to 7 sigma in 0 1 sigma steps Default 7 Changing Conditions...

Страница 50: ...information see Description of Parameters Used in Calculations page 6 2 Note that the probability is also expressed as a percentage in parentheses Values 0 to 10 sigma in 0 1 sigma steps Default 1 65...

Страница 51: ...AM12 reverts to Normal Background Monitoring Values 3 to 360 s Default 10 s Quick Scan Period s This is the length of time in seconds for the Quick Scan to run see Options page 5 6 Values 3 to 60 s De...

Страница 52: ...lues 0 5 to 10 in 0 1 steps Default 1 00 Calibration Confidence This factor affects the monitoring time of calibration Values 0 1 to 4 sigma in 0 1 sigma steps Default 2 Note that this section is set...

Страница 53: ...s is the detected activity at which SAM12 will indicate a CCM High Level Alarm The Enabled tickbox must be checked for this option to take effect Values 0 to 10 000 000 Any unit Default Must be input...

Страница 54: ...intended for barrier applications and has optional door interlocking to ensure clearance integrity It operates in the same way as the single door version except when a CLEAR result is obtained the art...

Страница 55: ...Alarm Select Set Up Messages to select a message to configure Use the direction arrow to find a Message to configure Once selected the text can be updated by pressing on the Headline Headline 2 and I...

Страница 56: ...nt settings and background The MDA is calculated using the probability of detection probability of false alarm monitoring time and the average background etc Dashes are shown if this value is not avai...

Страница 57: ...field 2 If you require a Continuous count to be made tick the Continuous box 3 Press Start button To toggle between the Thresholds and Windows display tick the relevant radio button The variance chec...

Страница 58: ...ess Abort button to abandon the check If the check is left to run the results are displayed as follows Press Back button to return to the Test Parameters window Select Diagnostics Vault to test the Do...

Страница 59: ...s to view the selected Detector Efficiencies Use the direction arrows to select a Calibration Once selected press the Details button to view the Gross Sum Efficiency for the selected Calibration The V...

Страница 60: ...ws to select a Calibration Source Once selected press Edit button to display the Edit Source properties window Description of options Field Name Description Nuclide This option is only available when...

Страница 61: ...actor The Cal Check function informs the user of any discrepancy with the current calibration factor To Check the SAM Calibration select a Calibration Source and Calibration Accuracy Then press Calibr...

Страница 62: ...alibration time Note that the Calibration time is the sum of the Background and Source measurements The minimum time is 20 seconds When the Flash Measurements are complete and the Calibration time is...

Страница 63: ...n is displayed which returns to the Calibration Cal Check screen Note that the Cancel button will abandon the process Press the details button to reveal the detailed results If you are satisfied with...

Страница 64: ...rror messages Error Message Resolution Unable to calculate a valid monitoring time 1 There is no source available 2 The source does not have enough activity 3 If a cobalt calibration has been activate...

Страница 65: ...ress Apply Settings button to save or Cancel button to quit without saving To delete an existing Calibration Mix highlight the Calibration Mix for deletion and press the Delete Mix button Select Calib...

Страница 66: ...he counts against each amplifier threshold for all amplifiers at each HV step over the specified integration period A progress window is displayed Once the Background Scan is completed the Ready to St...

Страница 67: ...nd Apply Settings to save the Scan Note that selecting NBR enables the NBR Enabled option in the Options screen see Options page 5 6 Press Cancel Changes to quit without saving or press Back to return...

Страница 68: ...shold value should be set to a voltage that is less than that of the preceding threshold For example Threshold 5 must be set greater than or equal to Threshold 4 Failure to follow this advice may inva...

Страница 69: ...nd the calculated count time decrements The progress window is displayed until the Empty Vault Measurement Complete window is displayed Insert the Phantom Sample into the vault and press the Start but...

Страница 70: ...s an estimate of the Coincidence Period set in nanoseconds Select CCM Information to view the status information for the CCM Channel Description of options Field Name Description MDA default units Not...

Страница 71: ...is a view only field This is the effective alarm rate for the CCM Channel calculated using the CCM Alarm setting taking account of current alarm conditions and background measurement see Alarms page...

Страница 72: ...steps through the report pages Page Setup display the Report Page settings Enter the required settings and press OK The Print button sends the report to the printer The Save button displays the Drive...

Страница 73: ...33 This report shows the Background Rate Trend between the selected Start and End Dates It is possible to limit the report by Start and End Date Press on one of the ID records to display the Backgroun...

Страница 74: ...Operating Instructions Issue 1 0 5 34 SAM12 User Manual Thermo Fisher Scientific...

Страница 75: ...User Manual 5 35 This report lists Calibration History for the SAM12 It is possible to limit the report by Start and End Date and Full Cal Please note that the report below is an example and does not...

Страница 76: ...selected Start and End dates It is possible to limit the report by Start and End Date This report lists the HV Scan details between the selected Start and End dates It is possible to limit the report...

Страница 77: ...Issue 1 0 Operating Instructions Thermo Fisher Scientific SAM12 User Manual 5 37 Please note that the report below is an example and does not display all the information...

Страница 78: ...Operating Instructions Issue 1 0 5 38 SAM12 User Manual Thermo Fisher Scientific This report lists the current Instrument Configuration settings Instrument Configuration Report...

Страница 79: ...ter 0 for unlimited results Press on one of the ID records to display the Activity Results Detail for the selected Results ID This report lists the Background Variance Test Summary Results between the...

Страница 80: ...y pressing individual names or press the Select All button Press the Save to File button to display the edit options window Select a Start End Date and enter an Archive Name and File Location Select t...

Страница 81: ...played Select OK to shut the entire system down Select System Setup to set the location volume date time and time zone To change the Location enter the location using the alpha numerical field To adju...

Страница 82: ...hange the Password for a select User press in the Select User field to display the user roles Select a User and select OK Enter a Password and confirm the Password Ensure each password level has a uni...

Страница 83: ...to work with the SAM12 Instrument ID Enter the Instrument ID using the numerical field Report Interval s This is the interval in seconds that the system checks the connection to the interface Primary...

Страница 84: ...ils see below Fallback select this option for the Serial details to be used if the Primary and or Secondary connections fails Enabled select this option for the Serial details to be used Serial COM Po...

Страница 85: ...nce Monitoring page 5 53 Monitoring continues for a period determined by the required confidence levels and the current background Monitoring may be interrupted due to the result of a QuickScan assess...

Страница 86: ...messages are user definable see Messages page 5 15 Five light system which mimics the larger status indicator SAM12 press here to enter Administrator Mode page 5 1 Battery Mains Supply Indicator page...

Страница 87: ...vity check i e check that the local database is available If the System Self Testing passes the Self Checks pass message is displayed for a few seconds If the System Self Testing fails the Out of Serv...

Страница 88: ...a new Background has been established the Ready OPEN DOOR TO MONITOR ARTICLES message is displayed The SAM12 is now ready to start monitoring articles If the front door is opened when the SAM12 is est...

Страница 89: ...added to the results store with the oldest being discarded In this way a mean background is stored and constantly updated for each of the detectors see Background Update page 6 5 for more information...

Страница 90: ...ew background background counting stops the ILLEGAL DOOR SEQUENCE message is displayed and an audible alarm will sound To continue with the process the door must be shut See Doors page 5 13 for more i...

Страница 91: ...larm lamp will light and Updating Background Please Wait message is displayed while a fresh 100 second Background is accumulated see Background Update page 6 5 for more information After every success...

Страница 92: ...displayed in the Operational Mode display bar Note that when the door is opened the background monitoring is suspended Deposit the article to be monitored in the SAM12 and close the door Note that Doo...

Страница 93: ...If the START button is not pressed within the Measurement Start Timeout see Params 2 page 5 10 for more information Normal Background Monitoring is resumed and SAM12 returns to the Ready Open door to...

Страница 94: ...pressed within the Measurement Start Timeout the Normal Background Monitoring is resumed and SAM12 displays the Ready Open door to Monitor Articles screen If the background changes during a measureme...

Страница 95: ...tes real clean the user is informed audibly and visually of the result with instructions to remove article The Clear message is displayed Note that this message is user definable See Messages page 5 1...

Страница 96: ...M12 CANNOT DISTINGUISH BETWEEN A GRADUAL BUILD UP OF CONTAMINATION AND SMALL BACKGROUND CHANGES THEREFORE IT IS STRONGLY RECOMMENDED THAT A REGULAR FRISKING PROCEDURE IS ADOPTED AND OR AN INSPECTION O...

Страница 97: ...before a result if the following is true High Level Alarm measurement Normal Alarm See Alarms page 5 12 for more information regarding Alarm settings Note that in the following section the Uncertainty...

Страница 98: ...or SAM12 the front door will be locked and back door will be unlocked Also a high alarm will sound for 5 seconds If the count rate from any detector exceeds 95 of the Amplifier dead time an Over Range...

Страница 99: ...intervention by an Administrator See Doors page 5 13 for more information regarding Lock Front Door on Alarm On a two door SAM12 the front door will be locked and back door will be unlocked Also a hi...

Страница 100: ...kground Count Rate before the alarm by a statistically significant amount If no contamination is found the Ready OPEN DOOR TO MONITOR ARTICLES message is displayed and the SAM12 reverts to Background...

Страница 101: ...ed the SAM12 performs the System Self Testing see Start Up Checks page 5 46 Two door SAM12 In a two door SAM12 open the front door to remove a clean or dirty Article the READY DEPOSIT ARTICLE AND CLOS...

Страница 102: ...tration Mode or will clear automatically when the Out of Service Recovery Interval is passed see Params 2 page 5 10 for more information See Actions page 5 40 for more information regarding clearing t...

Страница 103: ...Params 2 page 5 10 Relaxes the Probability of False Alarm see Params 2 page 5 10 Raises the Normal Alarm level see Alarms page 5 12 Minimum Detectable Activity MDA and High Background Criterion page 6...

Страница 104: ...which indicates whether the SAM12 is running on battery or mains supply as follows Indicates that the SAM12 is running on battery See Battery Charger page 5 19 for more information regarding Battery...

Страница 105: ...d radiation This effect is minimised by shielding the detectors on all six faces with 1 or 2 of lead Low energy variants are fitted with an additional 2 mm Copper shield to absorb the secondary x rays...

Страница 106: ...l type test report is available from Thermo Fisher Scientific on request Explanation of the Operational Calculations It is a requirement to measure contamination on personal articles as quickly and ac...

Страница 107: ...e for which Articles are monitored The calculated monitoring time Tcal is first rounded up to the nearest whole second It is then compared with the user programmed Minimum Monitoring Time Tmin and if...

Страница 108: ...F in terms of sigma is set in Params 2 page 5 10 where the associated probability is shown alongside in parentheses The value is usually set as high as possible so that false alarms do not occur e g o...

Страница 109: ...ed in 10 second periods each measurement contributing to a rolling average produced over a fixed 100 second period i e 10 measurements Measurements subsequent to the 10th are added to the results stor...

Страница 110: ...s gross changes in any single channel while the latter guards against significant drift in all channels After every successful 10 second background update the average background for each channel is up...

Страница 111: ...Act Act where Act is the activity unit m Detectable Activity and Detection Limit may be viewed on the Information sub menu see Information page 5 16 and will be displayed in the units selected in the...

Страница 112: ...with the alarm level So an alarm condition exists if effect eff gross C B C The system will display both the activity of contamination on in the article and its associated uncertainty Both of these op...

Страница 113: ...n an alarm an NBR check may be undertaken if enabled on the Options sub menu see Options page 5 6 For details of the NBR assessment please contact Thermo Fisher Scientific A specific assessment of 60...

Страница 114: ...0 second background and source counts to automatically calculate the count time for the user The Calibration Accuracy and the associated confidence level is set in Params 3 menu see Params 3 page 5 11...

Страница 115: ...otal Bgnd typ 60 Co 1 2 MeV 137 Cs 662 keV 137 Ba 356 keV 10 R h 0 1 Sv h 3 inches Centre 3 inches Centre 3 inches Centre 4C XD 1L 350 cps 45 40 48 40 36 44 17 16 20 16 15 19 28 26 31 26 24 28 6C 2D 1...

Страница 116: ...ng Time 6C 2L 61 350 cps 4 5s 6C 1L 61 550 cps 7 1s 99 2 4 4C 1L 45 350 cps 8 5 6C 2L 61 350 cps 3 3s 6C 1L 61 550 cps 5 2s 95 1 65 4C 1L 45 350 cps 6 1s 6C 2L 61 350 cps 2 8s 6C 1L 61 550 cps 4 4s 90...

Страница 117: ...3 2 4 99 18 2 5 99 38 2 6 99 53 2 7 99 65 2 8 99 74 2 9 99 81 3 0 99 87 3 1 99 90 3 2 99 93 3 3 99 95 3 4 99 966 3 5 99 977 3 6 99 984 3 7 99 989 3 8 99 993 3 9 99 995 4 0 99 997 This probability refe...

Страница 118: ...l Description Physics Issue 1 0 6 14 SAM12 User Manual Thermo Fisher Scientific Posi tion Across Height of SAM12 Figure 1 Front Spatial Response Position Across Height of SAM12 Figure 2 Side Spatial R...

Страница 119: ...o Back SAM12A 4C 2D 1L SAM12 Type Test Data Four Detectors And 1 0 Lead Variation in Efficiency Along Centre Axis Bottom to Top 0 10 20 30 40 50 60 1 2 3 4 5 6 7 Position of 60 Co Source Figure 4 Effi...

Страница 120: ...D1 D2 D3 D4 D5 D6 D7 D8 D9 H1 H2 H3 H4 H5 H6 H7 Position Along Depth of SAM Position Across Height of SAM SAM12 One Door Six Detectors 2 0 Lead Copper Absorber Steel Liner Efficiencies to 60Co As Vie...

Страница 121: ...orber Steel Liner Variation in Efficiency Along Centre Axis Front to Back 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 1 2 3 4 5 6 7 8 9 Position of 60Co Source Efficiency PHOTOMULTIPLIERS Figure 8 V...

Страница 122: ...Technical Description Physics Issue 1 0 6 18 SAM12 User Manual Thermo Fisher Scientific Efficiency Figure 10 Variation along Central Axis Left to Right SAM12A 6C 1D 2L...

Страница 123: ...embly drawing E91885 A This comprises all the interface buffers and connections necessary to communicate between all peripherals and the proprietary on board plug in ETX processor The ETX unit plugs i...

Страница 124: ...A windows type Key bleep on PL21 6 A watchdog output via TR1 in parallel with the on board reset switch S1 IC6 IC8 provide for RS232 voltage levels on PL8 PL9 Label Connection PL8 9 Function TXD 5 Tr...

Страница 125: ...terlock Magnet clean OUT3 PL18 Not Used OUT4 PL19 Not Used Battery Controller Board Type 5660A Battery Controller Board type 5660A is shown on assembly diagram C91799 A This is an X channel device whi...

Страница 126: ...or the battery contains sufficient charge or both This is achieved by turning the key clockwise for at least 2 seconds Secondly the instrument can be switched OFF should the operating software fail t...

Страница 127: ...intillation detectors are connected via MHV connectors on PMT1 2 Coincident outputs are on BNC connectors OUT1 2 X15 X16 These connectors provide power supplies to the board and RS485 terminations X15...

Страница 128: ...a maximum rate of 3 3 A up to 40 C This module contains AC Mains and dangerous DC switching voltages It should not be operated with the protective cover removed or the mains ground earth conductor di...

Страница 129: ...terference and emissions It is therefore vital that the construction standard is maintained at all times particularly when replacing parts and during servicing Earthing is particularly important for c...

Страница 130: ......

Страница 131: ...SAM12 with door locks opening one door will lock the other Alternatively the locks can be exercised individually see Vault page 5 18 for more information During calibration or more frequently if requi...

Страница 132: ...Touch Screen or Touch Controller to re calibrate the touch screen This is an Administration function and the facility would be accessed outside of the application program Periodically and after Servi...

Страница 133: ...heck as described in Cal Check page 5 19 The check source is placed in the calibration position usually 3 inches from the bottom of the measuring volume The alarm response should be 2 out of 3 or grea...

Страница 134: ......

Страница 135: ...ill automatically pass into the User Mode In this mode the user will not have access to any operational parameters In order to set up the instrument the user requires a security dongle which should be...

Страница 136: ...SAMs it is essential that the door locking options are correctly configured before monitoring operation is allowed Doors page 5 13 describes the method for setting the doors correctly At this point i...

Страница 137: ...ck or to recalibrate follow the procedure described in Cal Check page 5 19 Whenever the operating voltage on a detector is changed the instrument must be recalibrated The details of the current and pr...

Страница 138: ...ibration NOTE For all the measurements performed below the door s should be fully closed in order to minimise the effect of background fluctuations All counts read from the detectors are corrected to...

Страница 139: ...a When the graphs are displayed select the NBR option and then press the respective graph for a detector which will expand it to fill the screen The optimum operating voltage is that which has a T1 T2...

Страница 140: ...oint as follows 1 The background count for each detector does not exceed the following Typical Maximum 1 inch 25 mm 10 cps R h 1000 cps Sv h 15 cps R h 1500 cps Sv h 2 inches 50 mm 6 cps R h 600 cps S...

Страница 141: ...he source is in geometric centre of volume If the overall system efficiency or any individual detector efficiency is too low or too high consider the source values at the next HV step review the backg...

Страница 142: ...a pair of filters which examine the ratio of pulse rates above different pulse height thresholds Since the ratios from NORM and typical man made radiation are well known then a degree of compensation...

Страница 143: ...Issue 1 0 Setting Up Procedure Thermo Fisher Scientific SAM12 User Manual 9 9 Figure 11 Statistical Limits of Counter Reliability...

Страница 144: ......

Страница 145: ...l values may be entered in these units Of course the equations remain unchanged though care must be taken to ensure that the units are consistent Calibration Validity The SAM is capable of undertaking...

Страница 146: ...e calibration The SAM12 is then ready for calibration Calibration Ensure the background is stable the door is closed and any calibration sources are well away from the SAM12 at least 8 feet 1 Ensure t...

Страница 147: ...rocedure The Instrument Configuration Report See Reports page 5 31 will provide a hard copy of the set up and calibration results Calibration for Other Nuclides See HV Scan page 5 25 for more informat...

Страница 148: ...the overall percentage efficiency to the mix appropriately Troubleshooting CHECK IMMEDIATE AREA AROUND SAM12 FOR A LOCAL SOURCE OR DIRECTIONAL BACKGROUND FIELD SHINE The background operating voltage...

Страница 149: ...t is removed It must be noted that a failure of the LCD backlight module will leave the display blank even though boot up is taking place correctly In a normal boot up the Bios sequence of tests will...

Страница 150: ...ecking mode certain aspects of the instrument s operation are tested repeatedly If a fault is detected the SAM12 will display the appropriate message as follows 1 Amplifier Failure 2 Amplifier Counter...

Страница 151: ...P COVER To gain access to the 5689A Electronics Chassis components the Top Cover must be removed To do this remove the 2 screws securing the top cover to the Electronics chassis Lift the top cover cle...

Страница 152: ...e 11 3 deflect the restraining plastic on the PSU to one side to release the module from the aluminium bracket supporting the 5660A Unplug PL4 from the 5660A and gently ease the PSU and cable from und...

Страница 153: ...S REFITTED CORRECTLY OVER THE RED POSITIVE BATTERY TERMINAL Reconnect the thermistor card to the BLACK terminal last Failure to do this may impair charging control and may lead to premature battery fa...

Страница 154: ...oved from the Electronics chassis Replacement of the Controller PCB is the reverse of the removal procedure Should the Controller thought to be faulty it should be replaced with an identical unit See...

Страница 155: ...prise each pcb from it s mounting spacers Replacement of any of the boards is the reverse of the removal procedure Ensure the colour coded detector cables are matched to the correct amplifier connecto...

Страница 156: ...er are propriety items and are not user serviceable They should be returned to Thermo Fisher Scientific s service department for repair or replacement Four screws attach the LCD shield to the front be...

Страница 157: ...Steel Liner from the Cabinet to exposes the detectors Undo the wing nuts that hold the detectors in place and slide the detector to the rear of the SAM12 When space allows disconnect the detector coa...

Страница 158: ...ews securing lever catch to door bracket in 3 positions for version with 50mm lead and a counter fitted to door the M5 screws are secured with M5 crinkle washers and M5 nuts 3 Replace and secure Lever...

Страница 159: ...cure in position with 8 32 UNC grubscrew remove 0 4mm of laminates from existing catch shim 2 Replace catch Strike Block and secure in vertical position noted earlier 3 Close door push start switch pu...

Страница 160: ...th two doors check switch operation as detailed in Section 11 4 3 11 Replace and secure main liner Trouble Shooting This Section covers a number of possible operational problems their likely causes an...

Страница 161: ...temporarily remove from pcb to check no output indicates the internal fuse has blown and the power supply should be replaced see Removal and Replacement of the Power Supply page 11 4 5 Check the outp...

Страница 162: ...background count from the detector channel is below the Low Background Alarm value set in Params 1 page 5 8 Proceed as follows 1 Enter a valid password and Setup Params 1 Check that the Low Backgroun...

Страница 163: ...Setup Params 2 and check the Probability of Detection is set to a reasonable value Reduce it if necessary 5 Select Calibration HV Scan and check the High Voltage settings of ALL six detector channels...

Страница 164: ...ller board 2 Any device failure will need a replacement board 3 If there are two lamp assemblies and neither are functioning then a fault on the Controller board is indicated and it should be replaced...

Страница 165: ...eries of Self Test Messages as each lamp is tested If the back light fails to light proceed as follows 1 Check the cabling from the back light inverter enclosure to PL7 on the Controller board 2 Check...

Страница 166: ...electing Diagnostics Vault The switch is situated in the left hand vertical box section of the main frame and is operated by closing the door Replace any switches if necessary 2 Check the continuity o...

Страница 167: ...crashing may indicate that the Controller board needs replacing as described in Controller Board type 5670A Removal and Replacement page 11 6 possible that the hard disk may have suffered some damage...

Страница 168: ......

Страница 169: ...that first line service is best performed by changing modules CONTROLLER BOARD 5670A ETX Processor 702695PE SECURITY DONGLE A92169 A BATTERY CONTROLLER BOARD 5660A HV AMPLIFIER BOARD FHT681 425430223...

Страница 170: ...URE SENSOR 5659B HV AMPLIFIER BOARD FHT681 42543 0223 CCM BOARD FHT681 42543 0224 SAM 12 only SCINTILLATION DETECTOR 5569A LAM12 only SCINTILLATION DETECTOR TYPE 5390B DC DC CONVERTER BOARD 5675A LOUD...

Страница 171: ...TEMPERATURE SENSOR BRD General Assy C91794 A 5660A BATTERY CONTROLLER BRD General Assy C91799 A 5670A ETX CONTROLLER BOARD General Assy E91885 A 5671A DUAL CHANNEL R2422 BOARD General Assy C91929 A 5...

Страница 172: ...CHANNEL R2422 BOARD General Assy C91929 A 5675A DC DC CONVERTER BOARD General Assy C91965 A SAM 12 only SAM12 FAMILY TREE C92049 5672A 5 WAY LED CLUSTER General Assy D91956 A 5670A ETX CONTROLLER BOAR...

Страница 173: ...er minute Door s Detection limit Disintegrations per minute Efficiency Correction Factor Probability of False Alarm Figure of Merit Person Persons or Team responsible for setting up day to day running...

Страница 174: ...Activity of Contamination Residual Contamination Count Small Article Monitor Personnel who normally repair and maintain the instrument in working condition Background Update Time Calculated Monitoring...

Страница 175: ...Ccps 6 4 Ceffect 6 4 Changes to the Normal Background Monitoring 5 49 CLEAR Result 5 55 Commence Monitoring 5 53 Critical Error 5 62 D Data Menu 5 31 Data Retention 5 42 Date Functions 5 2 Descriptio...

Страница 176: ...0 Params 3 5 11 Passwords 5 42 Performing the HV Scan 9 4 Power Supply Replacement 11 4 Pre defined Functions 5 2 R RAct 6 5 Recount 5 56 Remove Articles 5 61 Replacement of the Charger PCB 11 5 Repla...

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