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Ludlum Measurements 2241-2, Manual

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Model 2241-2RK 

Technical Manual   

 

Section 2

 

Ludlum Measurements, Inc. 

Page 2-5 

July 2012 

Compare the first reading with the second to determine the 

amount of alpha and beta contribution. (This will be a very 

rough number.)  

Gamma and X-ray

: For gamma and high energy X-ray, the gamma 

scintillator (Model 44-2) must be used.  

This detector is approximately 50 times more sensitive than 

the pancake (Model 44-9) detector. This detector is able to 

detect low-level gamma and X-rays in the range of 60 keV- 

1.25 MeV. This detector may be used for measurements up 

to 50 mR/hr. 
The Model 44-2 is used by placing the detector in hand, and 

by slowly moving it from side to side over the area to be 

measured.  
Be aware that the very end of the detector, opposite the 

connector, is the most sensitive. Point the detector towards 

the radiation being measured.  

 

 

Summary of Contents for 2241-2

Page 1: ...LUDLUM MODEL 2241 2RK RESPONSE KIT July 2012 Serial Number 237627 and Succeeding Serial Numbers ...

Page 2: ...LUDLUM MODEL 2241 2RK RESPONSE KIT July 2012 Serial Number 237627 and Succeeding Serial Numbers ...

Page 3: ......

Page 4: ... Main Board Controls 4 4 Switch Board Controls 4 5 Safety Maintenance Considerations 5 Environmental Conditions for Normal Use 5 1 Detector Connector 5 1 Warning Markings and Symbols 5 1 Maintenance 5 2 Operational Check 5 3 Recalibration 5 3 Batteries 5 3 Detector Model 44 9 Tube Replacement Procedure 5 4 Radiation Basics 6 Radiation and Life 6 1 The Unstable Atom 6 2 Radioactive Decay 6 3 Ionizi...

Page 5: ...ition Descriptions and Variables 8 2 Calibration 8 7 General Detector Setup Information 8 8 Counts per minute C m Calibration 8 9 R hr Calibration 8 11 Determining CC and DTC 8 12 Detector Overload OVL Calibration 8 19 Loading Default Parameters 8 20 Software License Agreement 8 21 Recycling 9 Parts List 10 Model 2241 2 Survey Meter 10 1 Main Circuit Board Drawing 408 223 10 1 Calibration Board Dr...

Page 6: ...ng parameters when changing out detectors Programmable display units RATEMETER mode only can be represented in R hr Sv h cpm or cps with multipliers of micro µ or milli m for R hr and Sv h and kilo k for cpm or cps The display units are auto ranging enabling the readout to display a broad range of radiation levels The display also offers lower limit capability For example the display can be set to...

Page 7: ...rs and connecting cable lengths All of the calibration controls are covered to prevent any inadvertent adjustment to the detector operating parameters The instrument is powered by two standard D cell batteries The unit body is made of cast and drawn aluminum with beige powder coating which aids in the decontamination of surfaces The Detectors The Response Kit s GM Geiger Mueller Pancake Detector M...

Page 8: ...ing by a factor of 0 5 above 1 MeV when normalized to 137 Cs The response of this detector is nominally linear within 10 from 5 µR hr to 50 mR hr This detector consists of a one inch 2 54 cm diameter by one inch thick Nal crystal coupled to a photomultiplier tube and is housed in 0 16 cm 0 062 in thick aluminum housing Recommended instrument sensitivity is approximately 10mV or higher Operating vo...

Page 9: ...cation Important If multiple shipments are received ensure that the detectors and instruments are not interchanged Each instrument is calibrated to specific detectors and is not interchangeable To return an instrument for repair or calibration provide sufficient packing material to prevent damage during shipment Also provide appropriate warning labels to ensure careful handling Include detector s ...

Page 10: ...includes a color code at the detector selector switch which corresponds to color coded detectors included in the kit This serves as a reminder quick reference of the set detector parameters for each position See Section 8 Subsection Factory Settings Page 8 1 for the color code Turn the OFF SCALER RATEMETER switch to the RATEMETER position Notice that the display goes through an initialization sequ...

Page 11: ... and confirm that the external unimorph speaker produces an audible click for each event detected audio divide by 1 parameter The AUD ON OFF switch will silence the clicks if in the OFF position however an audible alarm condition will still be heard Increase the source activity or lower the alert and alarm points to initiate an ALERT and ALARM condition Refer to Section 8 Entering or Changing Swit...

Page 12: ...m Model 2241 2 Response Kit the pancake detector Model 44 9 must be used for detection of alpha Keep in mind that moisture or dirt may block alpha particles making them impossible to be measured All shielding material must be removed from the suspected source Ensure that the instrument F S switch is in the F position When surveying for alpha it is very important to get the window of the detector w...

Page 13: ...his detector is approximately 50 times more sensitive than the pancake Model 44 9 detector This detector is able to detect low level gamma and X rays in the range of 60 keV 1 25 MeV This detector may be used for measurements up to 50 mR hr The Model 44 2 is used by placing the detector in hand and by slowly moving it from side to side over the area to be measured Be aware that the very end of the ...

Page 14: ...calibrated the RATEMETER can display in R hr Sv h cpm or cps when the control switch is in the RATEMETER position SCALER activated by pushbutton in handle when the three position switch is in the SCALER position Count time is adjustable Calibration Controls accessible from the front of the instrument protective cover provided These controls are preset at the factory or calibration lab and should n...

Page 15: ...ss than 3 from fully charged batteries until the battery symbol appears indicating the need for recharge or replacement Battery Life typically 200 hours with alkaline batteries display indicates low battery condition Instrument will operate for approximately 24 hours after the battery symbol first appears Size 16 5 x 8 9 x 21 6 cm 6 5 x 3 5 x 8 5 in H x W x L Weight 1 6 kg 3 5 kg including batteri...

Page 16: ... instrument will automatically adjust the response time to the best setting for the current count rate Variable Response dependant on the number of counts present typically 4 to 25 seconds for FAST and 4 to 60 seconds for SLOW Fixed Response The parameter is adjustable from 1 25 seconds resulting in a FAST response from approximately 2 50 seconds The SLOW response is approximately 10 250 seconds F...

Page 17: ...n aluminum housing with beige powder coat paint Size 4 6 x 6 9 x 27 2 cm 1 8 x 2 7 x 10 7 in Weight 0 5 kg 1 lb Indicated Use measuring low levels of mid to high energy gammas Scintillator 2 5 cm diameter x 2 5 cm thickness 1 x 1 in sodium iodide NaI T1 scintillator Sensitivity typically 175 cpm per µR hr 137 Cs Tube 3 8 cm 1 5 in diameter magnetically shielded photomultiplier Operating Voltage ty...

Page 18: ...sed above the preset alarm threshold An audible continuous tone will accompany the latching ALARM condition Depressing RESET will acknowledge the audible ratemeter and or scaler alarm Depressing RESET a second time will reset the ratemeter reading and ratemeter alarm To reset the scaler ALARM depress the COUNT switch located in the carrying handle to re initiate the scaler count cycle ALERT Rateme...

Page 19: ...perating voltage of 2 2 0 1 Vdc Instrument will continue to operate for approximately 24 hours thereafter COUNTING This indicates that the scaler COUNT switch has been depressed and that the scaler is accumulating counts for the pre determined count time Front Panel Controls DET1 DET2 Detector Select Switch a protected locking toggle switch used to select between DET1 and DET2 parameters The switc...

Page 20: ...econd time will reset the ratemeter alarm and or alert condition The scaler alarm can only be reset by depressing the scaler COUNT switch located in the end of the Model 2241 2 handle Note The RESET button only silences the alarm in the current mode that the instrument is in For example the RESET button will not affect the scaler alarm if the instrument is in the ratemeter mode Scaler COUNT Switch...

Page 21: ...es the detector voltage from 200 to 2500 volts The maximum high voltage output is adjusted by the HV LIMIT potentiometer located on the internal main board OVL Detector Overload a multi turn potentiometer approximately 20 revolutions that adjusts the detector current level that must be exceeded to initiate an OVERLOAD alarm This control adjusts the current level discrimination point from 0 5 and 4...

Page 22: ...e when active Switch Board Controls The switch board utilizes a 16 position rotary switch FUNCTION to select the 16 setup parameters Refer to schematics and component layout drawing near the end of the manual All of the setup parameters are stored in the non volatile EEPROM which will retain data even after the Model 2241 2 batteries are removed After the parameters are entered the switch board ca...

Page 23: ...on becomes conductive due to condensation This is typical of industrial or construction sites Detector Connector Caution The detector operating voltage HV is supplied to the detector by way of the input connector A mild electric shock may occur if contact is made with the center pin of the input connector Switch the Model 2241 2 to the OFF position before connecting or disconnecting the cable or d...

Page 24: ... following precautions to avoid contact with internal hazardous live parts that are accessible using a tool 1 Turn the instrument power OFF and remove the batteries 2 Allow the instrument to sit for one minute before accessing any internal components The crossed out wheelie bin symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding Each mater...

Page 25: ... determine required recalibration intervals Ludlum Measurements offers a full service repair and calibration department We not only repair and calibrate our own instruments but most other manufacturer s instruments as well See Section 8 Instrument Setup Calibration for further details on instrument calibration BATTERIES The batteries should be removed and the battery contacts cleaned of any corros...

Page 26: ...unction DO NOT TOUCH 1 Remove the back plate by removing the three screws 2 Loosen the three set screws on the side of the tube housing 3 Remove the old tube from the detector housing 4 Remove the anode clip from the old tube 5 Push the clip onto the anode housing Note Do not over flex the wire when installing the clip 6 Carefully install the tube with the window face down in the housing Tighten t...

Page 27: ...frared to short wavelength ultraviolet which creates the hazard Beyond ultraviolet are higher energy kinds of radiation that are used in medicine and which we all get in low doses from space from the air and from the earth Collectively we can refer to these kinds of radiation as ionizing radiation It can cause damage to matter particularly living tissue At high levels it is therefore dangerous so ...

Page 28: ... more stable form This is called radioactive decay Apart from the normal measures of mass and volume the amount of radioactive material is given in curie Ci a measure which enables us to compare the typical radioactivity of some natural and other materials Radioactivity of some natural and other materials 1 adult human 2 7 X 10 9 Ci kg 1 89 X 10 7 Ci 1 kg 2 2 lb of coffee 2 70 X 10 8 Ci 1kg 2 2 lb...

Page 29: ...ubstance decay in a random fashion but at a characteristic rate The length of time this takes the number of steps required and the kinds of radiation released at each step are well known The half life is the time taken for half of the atoms of a radioactive substance to decay Half lives can range from less than a millionth of a second to millions of years depending upon the element concerned After...

Page 30: ...epresent energy transmitted in a wave without the movement of material just as heat and light from a fire or the sun travel through space X rays and gamma rays are virtually identical except that X rays are generally produced artificially rather than coming from the atomic nucleus Unlike light X rays and gamma rays have great penetrating power and can pass through the human body Thick barriers of ...

Page 31: ...nd can penetrate up to 5 64 of an inch of water or human flesh Beta particles are emitted from many radioactive elements They can be stopped by a sheet of aluminum a few millimeters thick Neutrons are particles which are also very penetrating On Earth they mostly come from the splitting or fissioning of certain atoms inside a nuclear reactor Water and concrete are the most commonly used shields ag...

Page 32: ...ease in cancers and leukemias cancer of the blood after some years delay It must also be assumed because of experiments on plants and animals that ionizing radiation can also cause genetic mutations that affect future generations although there has been no evidence of radiation induced mutation in humans At very high levels radiation can cause sickness and death within weeks of exposure see table ...

Page 33: ...on sickness with increasing likelihood that this would be fatal 100 rem in a short term dose is about the threshold for causing immediate radiation sickness in a person of average physical attributes but would be unlikely to cause death Above 100 rem severity of illness increases with dose If doses greater than 100 rem occur over a long period they are less likely to have early health effects but ...

Page 34: ... for maximum radiation at the perimeter fence of a nuclear electricity generating station In practice the actual dose is less What is the risk estimate According to the Biological Effects of Ionizing Radiation Committee V BEIR V the risk of cancer death is 0 08 per rem for doses received rapidly acute and might be 2 4 times 0 04 per rem less than that for doses received over a long period of time ...

Page 35: ...ld not be seen in this group due to natural fluctuations in the rate of cancer What needs to be remembered is that it is not known that eight people will die but that there is a risk of eight additional deaths in a group of 10 000 people if they would all receive 1 rem instantaneously If they would receive the 1 rem over a long period of time such as a year the risk would be less than half of this...

Page 36: ...ew York City air pollution Driving 40 miles in a car accident Flying 2500 miles in a jet accident Canoeing for 6 minutes Receiving 10 mrem of radiation cancer Adapted from DOE Radiation Worker Training based on work by B L Cohen Sc D Background Radiation Naturally occurring background radiation is the main source of exposure for most people Levels typically range from about 150 350 mrem per year b...

Page 37: ...of radiation from natural and man made sources There are three ways in which people are protected from identified radiation sources 1 Limiting time For people who are exposed to radiation in addition to natural background radiation through their work the dose is reduced and the risk of illness essentially eliminated by limiting exposure time Proper job planning is essential in achieving lowest exp...

Page 38: ...ces of radiation other than natural are regulated by laws passed by Congress Like any other law you have your right to voice your views and opinions about it The regulations that control the use of radioactivity in our country are based upon recommendations of science organizations like the International Commission on Radiological Protection ICRP the National Council on Radiation Protection NCRP t...

Page 39: ...ositive pulses from amplifier U021 are coupled to pin 2 of U011 comparator The discrimination level is set by the DISC control connected to pin 3 of U011 As the positive pulses at pin 2 of U011 increase above DISC reference at pin 3 pin 1 goes low producing a low pulse Pin 1 of U011 is normally held high 5 volts by R014 The low pulse from pin 1 of U021 is coupled to univibrator U001 U001 shapes an...

Page 40: ...e drop is developed across R031 and sensed by comparator pins 5 6 and 7 of U131 as detector current increases When the voltage at pin 5 of U012 goes below pin 6 pin 7 goes low signaling U111 µP to send the OVERLOAD alarm to the LCD OVL underneath CAL cover control provides adjustment for the overload set point Microprocessor µP U111 controls all of the data control inputs and display information T...

Page 41: ...ne is pulsed by the µP instructing the registers to transfer the data to the LCD drivers The backplane BP signal from U2 provides the reference signal approximately 125 Hz at 5 Vdc to the LCD DSP1 BP connection When a segment is illuminated the signal to that segment will be out of phase with the BP signal If the segment is OFF the signal will be in phase with the BP signal Backlight Drive Depress...

Page 42: ...R hr 85000 12 sec Entering or Changing Switch Board Parameters On the switch board select the desired parameter to enter or change by using the corresponding FUNCTION switch position Depress the ENTER button and a character on the LCD will start to flash The flashing character indicates that the program is in the parameter change mode To change the character press the UP button until the desired v...

Page 43: ...l operation mode counting mode is selected If the switch board is installed the selector switch must be set to the 0 position for normal instrument operation Detector Parameters Current Detector Setup in Use RS 232 Communication Baud Rate RS 232 Detector Parameters Set Read Mode FUNCTION SWITCH POSITION DESCRIPTIONS AND VARIABLES POSITION 0 NORMAL OPERATION places the Model 2241 2 in the normal co...

Page 44: ...RSION TABLE Conversion Rate Multiply by to get CC cps µR hr 3 6 x 109 cps mR hr 3 6 x 106 cps R hr 3 6 x 103 cpm µR hr 6 0 x 107 cpm mR hr 6 0 x 104 cpm R hr 6 0 x 101 cps µSv h 3 6 x 107 cps mSv h 3 6 x 104 cps Sv h 3 6 x 101 cpm µSv h 6 0 x 105 cpm mSv h 6 0 x 102 cpm Sv h 0 6 Example The Model 44 9 GM detector produces approximately 3300 cpm mR hr for 137 Cs 6 0 x 104 x 3300 198 x 106 for CC PO...

Page 45: ...t of the R Sv or C indicating the range µR hr mR hr R hr µSv h mSv h Sv h C s kC s C m kC m POSITION 4 TIME BASE CPS OR CPM selects the display time base for the current detector setup This time base only applies if the units are set to C Counts time The time base for R hr and Sv h is fixed in hr For true reading pulser calibration cpm or cps calibrations set the Calibration Constant CC parameter ...

Page 46: ...m time constant TC for the variable mode The fast position varies the TC from 4 25 seconds and the slow position varies from 4 60 seconds Fixed Response The Fast F response position is programmable from 2 50 seconds and the slow response is 5 times the fast TC For MDA type measurements the fixed response time mode is recommended POSITION 7 RATEMETER ALARM ALERT allows changing the ratemeter alarm ...

Page 47: ...es are 00 0 µ 000 µ 0 00 m 00 0 m 000 m 0 00 00 0 000 R hr 000 µ 000 µ 00 0 m 000 m 0 00 00 0 000 Sv h 0 00 00 0 000 0 00 k 00 0 k 000 kcpm or cps POSITION D RS 232 DATA DUMP MODE allows the RS 232 port to dump ratemeter data every two seconds The Model 2241 2 is fully functional during RS 232 data dump with the exception of the audio function The LCD will alternate between display of the ratemete...

Page 48: ...odel 2241 2 The program also incorporates an algorithm to calculate the detector Calibration Constant and Dead Time Constant The software is offered in a DOS version part number 1370 025 or a WINDOWS version part number 1370 024 Read the Software License Agreement at the end of this section before installing any LMI software Calibration The Model 2241 2 calibration routine consists of entering det...

Page 49: ...er selection of this point is the key to instrument performance Efficiency background sensitivity and noise are fixed by the physical makeup of the given detector and rarely vary from unit to unit However the selection of the operating point makes a marked difference in the apparent contribution of these three sources of count In setting the operating point the final result of the adjustment is to...

Page 50: ...ut a source present Measure the HV output then decrease the HV setting to operate 100 volts below breakdown Proportional Detectors For proportional detectors set the DISC control for 2 millivolt discrimination near maximum clockwise Expose the detector to a check source and plot count rate versus HV similar to the one in the figure below Refine the HV adjustment for optimum source efficiency with ...

Page 51: ...oints If the parameters are undetermined arbitrarily choose 0050 kC m for the alarm and 0045 kC m for the alert to confirm operation of the alert alarm function Position 8 selects the scaler ALARM parameter and the scaler count time If the values are unknown set the scaler alarm to 4500ALARM00 and the count time to 0060 60 second count time Position 9 is not used and position A is not used Switch ...

Page 52: ...nd ALARMs function by inputting the preset alarm levels as to initiate the alert and alarm conditions R hr CALIBRATION The following calibration procedure assumes that detector Calibration Constant CC and Dead Time Constant DTC are already known If these constants must be determined reference the following subsection Determining CC and DTC Switch the toggle switch to DET2 Detector setup number 1 i...

Page 53: ...S version part number 1370 024 Hi Lo Method The following summary lists the calibration constraints The hi lo method refers to the placement of the detector in a radiation field using a two point CC and DT calibration to make linear the detector response even in the non linear operating regions of the detector The low radiation field CC should be a field that yields from 2 to 5 count loss The high...

Page 54: ... Alm Alert 8 0060 s ScalerAlm Count Time 9 Not Used A Not Used B N A LCD Backlight C 000 C s Set Minimum Display D F N A RS 232 Parameters Equation 2 DT x 19 1 CPSLO5 The equations to the left Equations 1 4 determine the hi and lo radiation fields used to acquire counts for the CC and DTC algorithm These calculations require an unknown variable DT Dead Time Typical dead times for some of the stand...

Page 55: ...tween 240 and 619 cps and the hi field is between 5040 and 17 650 cps Dividing the cps values by the 55 cps mR hr conversion equates to between 4 11 mR hr for the lo field and 91 320 mR hr for the hi field Select a calibrated field between the lo and hi data points determined above lo CALlo 8 mR hr hi CALhi 200 mR hr The following procedure outlines the hi lo method units Sv R counts CALlo lo fiel...

Page 56: ...ed from equations 1 and 2 Insert the cps hi data point 200 mR hr for the Model 44 9 example determined from equations 3 and 4 Place the detector in the low field and enter the counts per second Note The low field count sample should be 3000 counts Use the Scaler and adjust the count time to accumulate count 3000 Equation 5 s 10 x 2 22 s 60 m 1 x m 60 h 1 x h R 0 008 CAL 6 lo Equation 6 s 10 x 55 6...

Page 57: ... Equation 8 s counts time count SAMPL CORR hi hi Counts second sample in high field of 200 mR hr Example C s 5830 1 5830 CORRhi Insert the values calculated in equations 5 6 7 and 8 and solve for fd Equation 9 s units CORR CAL x CORR CAL f lo lo hi hi d Example s 10 x 26 2 440 10 x 2 22 x 5830 10 x 55 6 f d 6 6 6 Solve for ad Equation 10 s count units CORR x CAL CORR x CAL a 2 hi lo hi hi d Exampl...

Page 58: ... x CAL CAL f lo lo lo cal Example s 10 x 2 14 10 x 84 x 440 x 10 x 2 22 10 x 2 22 f cal 6 6 6 6 Enter the result of equation 12 into Equation 13 units count f CORR CC cal lo and solve for CC Example 10 x 206 10 x 2 14 440 CC 6 6 Enter the CC and DT values positions 1 and 2 of the FUNCTION switch derived from the equations above Perform an R hr calibration as described in the previous subsection in...

Page 59: ...5 µs 44 2 Gamma Scint 2800 cps mR hr 8 12 µs 44 10 Gamma Scint 15 000 cps mR hr 18 20 µs 44 3 Low Energy Gamma Scint N A operated in Counts units mode 8 12 µs 44 21 Beta Gamma Scint N A operated in Counts units mode 8 12 µs 43 5 Alpha Scint N A operated in Counts units mode 20 28 µs Note The data represented in the table above is typical Actual values may vary among detector and instrument combina...

Page 60: ...rocessor For GM and gamma scintillation detectors the OVL trip point is adjusted to the point to where the readout no longer increases with increasing radiation intensity In the event that the overload point cannot be determined due to radiation field limitations adjust the overload point from 5 to 10 times the upper operating range of the detector Adjust the OVL control to the maximum countercloc...

Page 61: ...he light saturates the PMT Adjust the OVL control until the OVERLOAD just appears on the display Reseal the light leak connection and expose the detector to a radiation source that will produce a near full scale reading Confirm that the OVERLOAD alarm does not initiate Readjust the OVL control as required Loading Default Parameters To load the default parameters for all detector setups hold down t...

Page 62: ...Model2241 2RK TechnicalManual Section8 Ludlum Measurements Inc Page 8 21 July 2012 ...

Page 63: ...Model2241 2RK TechnicalManual Section8 Ludlum Measurements Inc Page 8 22 July 2012 ...

Page 64: ...Model2241 2RK TechnicalManual Section8 Ludlum Measurements Inc Page 8 23 July 2012 ...

Page 65: ... simply desires to inform its consumers of the range of recyclable materials present in its products so that the user will have flexibility in following all local and federal laws The following types of recyclable materials are present in Ludlum Measurements Inc electronics products and should be recycled separately The list is not all inclusive nor does it suggest that all materials are present i...

Page 66: ...4 5659 C012 0 1µF 50V 04 5663 C021 100pF 3KV 04 5532 C031 0 0047µF 3KV 04 5547 C032 100pF 3KV 04 5532 C033 0 0047µF 3KV 04 5547 C041 C043 0 0047µF 3KV 04 5547 C101 47µF 10V 04 5666 C121 47µF 10V 04 5666 C122 C123 27pF 100V 04 5658 C131 0 0047µF 3KV 04 5547 C132 C133 0 1µF 50V 04 5663 C134 0 01µF 50V 04 5664 C135 47µF 10V 04 5666 C136 0 01µF 50V 04 5664 C137 47µF 10V 04 5666 C138 100pF 100V 04 5661...

Page 67: ...D 06 6288 U111 N87C51FC 06 6303 U121 LM285MX 2 5 06 6291 U122 X24C02S8T5 06 6299 U131 LM358D 06 6312 U231 LT1073CS8 5 05 5852 SOCKET 44P 06 6613 CR021 MMBD7000LT1 07 6355 CR031 GI250 2 07 6266 CR041 CR044 GI250 2 07 6266 CR231 CXSH 4 EB33 07 6358 CR241 MMBD914LT1 07 6353 CR242 CXSH 4 EB33 07 6358 R002 10K 3269X1 103 09 6921 R027 1M 3269X1 105 HV LIMIT 09 6906 R001 100K 1 4W 1 12 7834 R011 R012 10K...

Page 68: ... R135 82 5K 1 8W 1 12 7849 R136 10K 1 4W 1 12 7839 R141 22 1K 1 4W 1 12 7843 R211 2 21K 1 4W 1 12 7835 R231 100Ohm 1 4W 1 12 7840 R241 2 21K 1 4W 1 12 7835 R242 200Ohm 1 8W 1 12 7846 Y221 6 144 MHZ 2 GND 3 GND 01 5262 L231 100uH CTX100 2 21 9740 T101 4275 083 AUDIO 4275 083 T141 L8050 40 0902 P1 1 640456 2 MTA100 12 13 8061 P2 1 640456 3 MTA100 13 13 8100 P3 640456 6 MTA100 6 13 8095 P4 640456 2 M...

Page 69: ...1K 1 3W 12 7750 R121 10K 1 3W 12 7748 R122 1M 1 3W 12 7751 P7 CONN 640456 8 MTA100 13 8039 BOARD Completely Assembled Display Board 5408 259 C1 27pF 100V 04 5658 U1 AY0438 I L 06 6358 U2 AY0438 I L 06 6358 R001 R004 10 0K 1 125mW 12 7839 R005 392 Ohm 1 1 8 W 12 7054 J1 CONN 640456 8 MTA100 13 8039 DS1 EL BACKLIGHT LED 07 6527 DSP1 MAIN DISPLAY LCD 8246 365 4E1 A W REV1 07 6383 RESISTORS CONNECTOR ...

Page 70: ... 2 13 8451 S1 30 1 PB GRAYHILL 08 6517 S3 S4 7101 SYZ QE C K 08 6511 S5 30 1 PB GRAYHILL 08 6517 S6 PA 600 210 08 6501 S7 MPS 103F 08 6699 S8 MTL 306D Toggle 08 6777 Switch Cap 08 6698 R1 10 M 1 4W 5 10 7031 J1 CONN 1 640442 2 MTA100 13 8407 J2 CONN 1 640442 3 MTA100 13 8138 J3 CONN 640442 6 MTA100 13 8171 J4 CONN 640442 2 MTA100 13 8178 J5 CONN 1 640442 2 MTA100 13 8407 J6 CONN 1 640442 3 MTA100 ...

Page 71: ...2 Main Harness 8408 151 Portable Harness Can Wires 8363 462 Switch Board Harness 8408 027 Model 2241 Can Assy 4408 081 Assembled Battery Lid 2363 191 Casting 7408 181 Front Panel Lexan 7408 208 Battery Lid Lexan 7408 209 Label Model 3 Cal Cover 2310602 Model 2242 Rolled Handle Assy 4408 178 Clip Probe with Screws 7010 008 01 2 ea Can Gasket 22 9773 Portable Knob 08 6613 Portable Battery Gasket 736...

Page 72: ...EN 21 9586 RED PROTECTIVE CAP 03 5476 UNIT Completely Assembled Model 44 2 Gamma Scintillator 47 1532 DETECTOR BODY 2002 084 01 END CAP 7002 029 02 2 5 x 2 5 cm 1 x 1 in Nal CRYSTAL 40 5154 3 8 cm 1 5 in TUBE SOCKET ASSY 4002 510 TUBE SHIELD 40 4006 PM TUBE 01 5742 CONNECTOR UG 706 U 13 7751 TEFLON WIRE 4 ea 21 9362 26 BLACK WIRE 4 ea 21 9558 LUG 18 8766 SCREWS 4 ea 17 8811 SPONGE 6 ea 7002 029 05...

Page 73: ...awing 408 127 Calibration Board Component Layout Drawings 408 128 2 sheets Display Board Drawing 408 259 Display Board Component Layout Drawings 408 260 2 sheets Switch Board Drawing 408 45 Switch Board Component Layout Drawing 408 46 Wiring Diagram Drawing 408 131 Model 44 9 Alpha Beta Gamma Detector Drawing 2 x 206 Energy Response for Ludlum Model 44 9 New Beta Source Efficiencies for Model 44 9...

Page 74: ...dlum Measurements Inc Page 11 2 July 2012 Model 44 2 Gamma Scintillator Assembly View Drawing 2 x 205A 1 5 in Tube Socket Board Schematic Drawing 2 x 317 1 5 in Tube Socket Board Component Layout Drawing 2 x 318 Energy Response Curve Model 44 2 ...

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