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Instruction Manual for MiniTRACE CSDF

 

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Page 10 

08/2012 

 

More information can be found at: 
Japan: 
http://www.mhlw.go.jp/english/topics/foodsafety/index.html 
http://www.mhlw.go.jp/english/topics/foodsafety/dl/110318-1.pdf 
 
Germany: 
http://www.bmu.de/atomenergie_sicherheit/doc/47216.php 

 

2.4.3  Measurement tasks for the MiniTRACE CSDF 

With the MiniTRACE CSDF you choose between the following operation modes: 
 

Mode 

Unit 

Lid open 

Lid closed 

Dose rate H*(10) (Menu RATE) 
Preferred direction observed, see Figure 27 

µSv/h 

- 

X 

Dose rate mean value H*(10) (Menu RMEAN) 
Preferred direction observed, see Figure 27 

µSv/h 

- 

X 

Count rate (Menu CPS) 

cps 

X (

α

, 

β

, 

γ

) 

X (

γ

) 

Count rate mean value (Menu CMEAN) 

cps 

X (

α

, 

β

, 

γ

) 

X (

γ

) 

Activity (Menu BQ) 

Bq 

X (

α

, 

β

, 

γ

) 

Not 

recommended 

Surface contamination (Menu BQCM2) 

Bq/cm

2

 

X (

α

, 

β

, 

γ

) 

Not 

recommended 

Count up (Menu COUNTUP) 

cps 

X (

α

, 

β

, 

γ

) 

X (

γ

)  

Food (Menu FOOD) 

Bq/l 

- 

X (

γ

) 

Table 2: Overview of measurements 

 
 
Note

:  

Measurement results in the “Surface contamination” (Bq/cm

2

) mode are based 

on ISO 7503-1. For the activity mode (Bq) we have calibrated the instrument in 
a 4 

π

 geometry. 

The internal calibration factors are default values and not individually calibrated. 

 
 
 

 

Figure 4: Opened protective lid 

Protective 
grid 

Pancake Geiger-
Mueller detector 
behind the grid 

Lid open, 
includes serial 
number, infor-
mation and 
energy filter 

Содержание MiniTRACE CSDF

Страница 1: ...www saphymo de Manual Type CSDF ...

Страница 2: ...iniTRACE CSDF 10 2 5 Accessories for measuring 21 2 5 1 MiniTRACE function test using a small test source 25 2 6 The design of the instrument 27 2 7 Protective rubber casing 28 3 Standard calibration for Co 60 and Cs 137 29 4 Maintenance and care 30 4 1 Changing the batteries 30 4 2 Cleaning Decontaminating MiniTRACE CSDF 30 4 2 1 Removing the grid 30 4 2 2 Cleaning the case 31 4 3 Technical prope...

Страница 3: ...2 Figure 19 Transparent plastic pouch 23 Figure 20 Transportation box 23 Figure 21 Peli Box 24 Figure 22 Emergency case 24 Figure 23 Test source see Chapter 2 5 1 25 Figure 24 Communication kit with MiniTRACE 25 Figure 25 Dose rate of the test source 26 Figure 26 CMean menu 26 Figure 27 Side view 27 Figure 28 Front view 27 Figure 29 Protective rubber casing 28 Figure 30 Changing the batteries 30 F...

Страница 4: ...e department MiniTRACE CSDF offers ease of use It is the ideal instrument for identifying possible contamination simply and quickly values are displayed in Bq Bq cm2 or cps depending on the mode You can also use it as a multifunctional survey meter With its energy compen sated Geiger Mueller pancake detector you can determine the ambient dose rate equivalent H 10 displayed in µSv h The device is a...

Страница 5: ...ilable measurement units CAPT Yes Detector error If the detector is defective the message CAPT will appear in the display The warning is triggered when the detector fails to send an impulse for a period of 40 seconds SAT Yes Saturation If the measurement range is saturated value out of range the message SAT will appear in the display This message will remain until the measurement area is no longer...

Страница 6: ...ust be closed The results will then be energy compensated to the ambient dose equivalent H 10 Rate mean mode RMEAN Dose rate mean value in µSv h To use this function properly the lid must be closed The results will then be energy compensated to the ambient dose equivalent H 10 To reset the calculated mean value press the mode button This function is used to gain measurement results of a higher pre...

Страница 7: ...tton Possible intervals are 60 120 300 600 1 800 and 3 600 seconds Food mode Contamination of food in Bq L Note If you turn on the instrument the last selected operation mode is still activated The default calibration factors are set for a distance of 3 mm between grid and surface For more details see Chapter 3 The MiniTRACE CSDF is UNABLE to identify radionuclides ...

Страница 8: ...e button activate Bq mode wait 3 sec unit Bq used radionuclude in the display press mode button select radionuclide wait 3 sec activate B q cm 2 mode wait 3 sec unit Bq cm 2 used radionuclude in the display press mode button select radionuclide wait 3 sec activate count up mode wait 3 sec measurement time in the display press mode button select measurement cycle 60 120 300 600 1800 3600 sec wait 3...

Страница 9: ...he long lived K 40 and the long lived radionuclides of the uranium radium and thorium decay series Alongside the nutrients necessary for growth plants and animals also absorb radionuclides due to their similar chemical properties The level of radionuclide concentration in food is determined by the radioactivity of the source media used soil water the availability of nutrients and other substances ...

Страница 10: ...rred direction observed see Figure 27 µSv h X Count rate Menu CPS cps X α β γ X γ Count rate mean value Menu CMEAN cps X α β γ X γ Activity Menu BQ Bq X α β γ Not recommended Surface contamination Menu BQCM2 Bq cm2 X α β γ Not recommended Count up Menu COUNTUP cps X α β γ X γ Food Menu FOOD Bq l X γ Table 2 Overview of measurements Note Measurement results in the Surface contamination Bq cm2 mode ...

Страница 11: ...e to determine the dose rate more precisely The longer the measurement the higher the accuracy This mode does NOT react to rapid changes in the radiation level To determine the mean value of the ambient dose rate equivalent H 10 correctly the lid must be closed When the lid is open the mean value of the ambient dose rate equivalent is not calculated correctly The value is given in µSv h In the top...

Страница 12: ...lt the radiation background has to be measured first and then subtracted from the final result α radiation can be shielded with a piece of paper β radiation is almost completely shielded by closing the lid 2 4 3 4 Mean value of the count rate in cps Select the CMEAN menu by using the mode button Once CMEAN is displayed wait 3 seconds the menu will start automatically For further details see Figure...

Страница 13: ... and then select the radionuclide The display will indicate whether an alarm threshold has been activated for the activity measurement The measurement will then start automatically You can assign your own calibration factor for the radionuclide User using the software For further information see the software manual Note MiniTRACE CSDF can not determine the radionuclide Selection of the radionuclid...

Страница 14: ...out allowing the MiniTRACE to touch the surface We recommend activating the acoustic registration of impulses SP oN menu If you find a contaminated area position the MiniTRACE at this point The distance between the surface and the MiniTRACE grid should be as little as possible we recommend approx 3 mm Before you start with this measurement you need to determine the background radiation and subtrac...

Страница 15: ...g the perforation Do not disconnect the filter from the foil Protect yourself against contamination by using the rubber gloves and the tweezers Wipe very carefully with the supplied filter over the averaging area In Germany the averaging area should not be larger than 100 cm2 Please check the guidelines in your country Put the filter in the filter cup with the side that is possibly contaminated fa...

Страница 16: ...not necessary to use a new uncontaminated wipe test sample put only the measurement cup in the measurement holder Example Measurement result of the background 5 Bq cm2 Measurement result of surface measurement 105 Bq cm2 Net value 105 Bq cm2 5 Bq cm2 100 Bq cm2 2 5 15 2 2 cm area wiped cm x cm Bq value net result Final Example Net value 100 Bq cm2 Wiped area 100 cm2 Area of the window of the GM de...

Страница 17: ...o students an insight into the statistical correlations between the radioactivity measurements 2 4 3 7Food measurement The instrument is calibrated to measure Cs 137 contamination in liquid or solid food The results are only precise if the food is contaminated with Cs 137 and when determined using the procedure described here For more information about radionuclides in food and limits for radiatio...

Страница 18: ... MiniTRACE software But note the shorter the measurement the higher the uncertainty If you work with a 2 hour measurement time the result will contain a 1 sigma uncertainty of 30 at a background level of 0 1 µSv h Be sure to use an area with a low radiation background as the lower the background level the more certain the result If you do need to measure with a high background level try to use a l...

Страница 19: ...n the memory of the MiniTRACE you will get an error message C ERR In this case you will need to conduct a background measurement We recommend not interrupting background measurement if you have changed measurement location or if the last background measurement was conducted on the previous day Background Control measurement takes about 2 hours 7 200 seconds and is important for the accuracy of the...

Страница 20: ...he cup Start the measurement of the sample food by pressing the mode button After approx 1 minute Wait is displayed measurement starts automatically In the display the remaining measurement time in seconds is given as well as the possible measurement limit e g L2500 that can be achieved Figure 14 Display in the Food menu The end of the measurement will be indicated by a beep and in the display the...

Страница 21: ...ents or as a survey meter It is also possible to test the instrument with a test source For MiniTRACE CSDF different accessory sets are available Set for the wipe test 1 Set for food measurement 2 Set for the test source 3 Set for communication 4 Set 1 Set 2 Set 3 Set 4 MiniTRACE CSDF Communication kit IR transmitter IR adapter with USB interface IR support and software X Wipe test kit Measurement...

Страница 22: ...Page 22 08 2012 Figure 16 Food measurement kit See Chapter 2 4 3 7 For measurement of the ambient dose rate equivalent no additional accessories are necessary Figure 17 Accessories for the wipe test See Chapter 2 4 3 5 4 Figure 18 Belt case ...

Страница 23: ...er it is only splash resistant Figure 20 Transportation box We recommend that during transportation by aircraft the instrument be carried on board as hand luggage If this is not possible you can also protect the instrument by using an airtight case such as our transportation box Saphymo GmbH takes no responsibility for any damage that may occur due to failure to comply with this warning ...

Страница 24: ... in general as well as for storage the instrument be protected from damage using our Peli Box Saphymo GmbH takes no responsibility for any damage that may occur due to failure to comply with this warning Figure 22 Emergency case The emergency case accommodates accessories for everything listed in Table 4 ...

Страница 25: ...wise the result can be inaccurate For calibration the Co 60 source is positioned exactly 3 mm away from the grid 2 5 1 MiniTRACE function test using a small test source A small test source is fixed in a sample see Figure 23 The test source consists of Radionuclide U 238 Activity 25 Bq 20 Half life time 4 468 109 a Dose rate of the MiniTRACE CSDF positioned in the measurement device approx 1 µSv h ...

Страница 26: ... CSDF in the measurement device 6 Select the CMEAN menu mean value of the count rate 7 If you use the CMEAN mode you will see the statistical uncertainty in the upper left corner We recommend measuring to a value of less than 3 statistical uncertainty see Figure 26 8 Subtract the count rate for the environmental background from the value you got with the source 9 Record the final result Figure 26 ...

Страница 27: ...00 meaning 100 If measurement result was too low you will need to set the value higher than 100 if it was too high you will need to set the value lower than 100 2 6 The design of the instrument The following images show the design of the instrument Figure 27 Side view Figure 28 Front view Key 1 Detector diameter 53 4 mm 2 Case fastening 3 Circuit board 4 Circuit board fastening 5 Battery compartme...

Страница 28: ...tive rubber casing the distance between the counter and the surface to be measured may be increased by approximately 2 mm This can influence the precision of the measurement result Note The calibration factors for contamination measurements are valid for a 3 mm distance between grid and surface Figure 29 Protective rubber casing ...

Страница 29: ... MiniTRACE CSDF to calcu late the calibration factor for the ambient dose rate equivalent For more information see the calibration certificate Users can also conduct their own calibration but will need the MiniTRACE user software see the separate software manual For the MiniTRACE CSDF default calibration factors for different radionuclides are stored in the instrument for the activity Bq and surfa...

Страница 30: ...he diagram in the battery compartment indicates how to place the batteries correctly The instrument is protected against damage to its polarity and thus cannot be harmed by the incorrect placement of the batteries 4 2 Cleaning Decontaminating MiniTRACE CSDF 4 2 1 Removing the grid Be very careful when removing the grid First close the protective lid in order to avoid damaging the counter tube with...

Страница 31: ... diameter 44 5 mm active counter tube surface 15 55 cm window 2 0 mg cm Grid 0 8 mm thick stainless steel easily removable 80 transparent Distance between grid and detector surface 3 6 mm Measurement intervals Automatic adjustment from 1 to 60 seconds Adjustable in Count up mode by buttons Display 6 digit 7 segment LCD display plus 5 digit alphanumeric display for alarm and status reports Alarm th...

Страница 32: ...casing is not in use 0 0 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 10 100 1000 keV Energy response Ansprechvermögen Figure 33 Energy response of the MiniTRACE CSDF based on Cs 137 with lid closed and GM tube energy compensated Energy keV Figure 34 Energy response of the MiniTRACE CSDF with open lid NOT energy compensated Relative Count rate ...

Страница 33: ... 0 105 9 57 Co 60 2 469 0 41 Sr 90 0 094 10 65 I 131 0 103 9 71 Cs 137 0 090 11 15 Am 241 0 240 4 19 U 238 0 240 4 19 Table 7 Calibration factors and efficiency MiniTRACE CSDF based on ISO 7503 1 Note For the 4 π calibration and for calibration based on ISO 7503 1 an individual radionuclide can be set by the user via the MiniTRACE software Its name is USER The user can also change all the calibrat...

Страница 34: ... software The MiniTRACE user software lets you read and show the status of the MiniTRACE set alarm thresholds and carry out calibration There is a separate manual describing how to install and use the MiniTRACE user software also called Communication Module for MiniTRACE ...

Страница 35: ...facturer For return shipping to the manufacturer a pressure tight box or suitcase must be used The warranty is voided under the following circumstances if the instrument has not been handled with due care if the instrument has been immersed in water if the counter tube has been damaged by a tool or other device or object if the instrument has fallen if the instrument has been opened other than to ...

Страница 36: ...Instruction Manual for MiniTRACE CSDF Page 36 08 2012 7 Appendix 7 1 DKD certificate for the Co 60 radiation emitter ...

Страница 37: ...Instruction Manual for MiniTRACE CSDF 08 2012 Page 37 ...

Страница 38: ...p view of reference emitter D Active diameter 45 mm Total size Ø 50 mm x 3 mm Cross section of the reference emitter 1 Imprint 2 Eloxided aluminum foil Thickness of the active coating about 5 µm 3 Attached with Epoxy a Thickness 3 0 mm b Inactive ring 2 5 mm ...

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