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2.5 Mode of radiocesium specific/volume activity measurement 

 
In this section we consider  a procedure of measurement of specific/volume 

activity of radiocesium on the example of food. Testing of soil and wood should be 
carried out in a similar sequence. 

To  enter  the  mode  of  specific/volume  activity  measurement  of  food,  touch 

the  TEST  button  in  the  mode  of  gamma  radiation  dose  rate  measurement  (see 
Fig. 2.4). You will see a window as shown in Figure 2.6. 

 

 

 

Figure 2.6 – Selecting a test type 

 

Summary of Contents for VIRTUOSO RKG-14

Page 1: ...RKG 14 VIRTUOSO multipurpose environment activity radiometer Operating manual I 412139 003 02...

Page 2: ......

Page 3: ...making quick conclusion of the overall pollution or purity of the area or premises where we are Since the device focuses on universal application in domestic and professional environment having consi...

Page 4: ...2 Version 8 Last updated June 2021...

Page 5: ...urement 47 2 6 MODE OF RADIOCESIUM SURFACE ACTIVITY MEASUREMENT 52 2 6 1 Sequence of determining surface activity of radiocesium in soil 55 2 6 2 Important recommendations for radiocesium surface acti...

Page 6: ...UM ISOTOPES SURFACE ACTIVITY STANDARDS UNDER NRBU 97 STANDARD 92 6 3 STANDARDS OF EFFICTIVE SPECIFIC ACTIVITY OF NORM UNDER NRBU 97 93 7 MANUFACTURER INFORMATION 94 APPENDIX 1 EXAMPLES OF MEASUREMENT...

Page 7: ...ive contamination from the reactor has reached a certain area on the contrary the absence of cesium in that particular area means that other contaminants from the reactor are considered unlikely There...

Page 8: ...ors radiocesium content under almost any conditions and causes no damage to a food package Apart from this with no need for a sample collection the device allows you to test for cesium not only food p...

Page 9: ...rdensome sampling procedure but also more reliable as radiation is measured from almost all volume of packaging rather than from the collected one of 0 1 l to 1 l Apart from radiocesium monitoring VIR...

Page 10: ...aterials 40 226 Ra 232 Th hereinafter NORM in the objects of the environment 1 2 Technical specifications Key specifications of the radiometer are presented in Table 1 1 Table 1 1 Key specifications o...

Page 11: ...bient dose equivalent rate from 137 Cs 134 Cs given 0 95 20 Unstable readings of the radiometer during 8 hours of operation not more than 5 Measurement range of gamma radiation ambient dose equivalent...

Page 12: ...and dimensions of the Android device are provided in the manufacturer s documentation for the device 1 2 1 Time of continuous operation of the Android device is specified in its user s guide 1 2 2 Da...

Page 13: ...ger 1 pc Model is not specified Leather case 1 pc PELI 1170 Transport case 1 pc PELI 1020 Additional waterproof case 1 pc Supplied under separate order BICT 412139 003 02 Passport 1 pc BICT 412139 003...

Page 14: ...ch runs the Android operating system Android is a trademark of Google Inc If some other Android device is used instead of the one included in the delivery kit you should make sure it meets the followi...

Page 15: ...13 1 4 2 Radiometer s detecting device is sown in Figure 1 1 a b Figure 1 1 Detecting device of RKG 14 VIRTUOSO multipurpose environment activity radiometer...

Page 16: ...sing the button 8 Once the detecting device switches on the COM LED 6 should be highlighted and start blinking quickly twice a second The detecting device switches off automatically every 3 minutes pr...

Page 17: ...erate from an external power supply Important Charge the battery of the detecting device within the ambient temperature range from 0 to 45 Noncompliance with this temperature range can cause failure o...

Page 18: ...interface uses the term detector instead of the detecting device therefore we are going to use the term detector for convenience in the description of this software to refer to the detecting device of...

Page 19: ...bol in the red background means that connection to the detector is either unstable or absent The latter may be caused by too long distance between the Android device and the detector The Battery 2 sym...

Page 20: ...18 2 3 Connecting the Android device to the detector 1 2 3 4 a 4 b 4 c Figure 2 2 Connecting the Android device to the detector...

Page 21: ...not display the detector s number go to 4 1 4 1 Tap Search If the Bluetooth device of the Android device is disconnected you will be asked for permission to turn it on It is necessary to allow enablin...

Page 22: ...ce at a distance of more than 3 m c there are problems with a Bluetooth enabled device of the Android device or the detector Figure 2 3 Connection to the detector failed If you cannot isolate the poss...

Page 23: ...rom the gamma detector shown graphically and numerically 3 Counts per second are graphically represented in green color in the range from 0 to 200 while from 200 to 1000 in yellow and from 1000 to 200...

Page 24: ...record will be added with coordinates of a location where the measurement was carried out If necessary you can tap UPDATE LOCATION to record the coordinates of the current location of the Android devi...

Page 25: ...vity of radiocesium on the example of food Testing of soil and wood should be carried out in a similar sequence To enter the mode of specific volume activity measurement of food touch the TEST button...

Page 26: ...the parameters of the food which will be tested for the presence of cesium isotopes and the last step evaluates their specific and volume activities The device features two modes for presenting test r...

Page 27: ...fic volume activity of radiocesium in food 2 5 1 1 Selecting a food group Figure 2 7 illustrates the window of specific volume activity measurement mode of radiocesium on the Food tab Figure 2 7 Selec...

Page 28: ...rink yoghurt cottage cheese butter sour cream Meat smoked meat products fresh fish sushi eggs Canned goods Vegetables fruits mushrooms Grain crops cereals dried pasta rusks biscuits sugar salt Dried v...

Page 29: ...commended list To do this select a food container thickness in centimeters with the help of a special scroll box see Figure 2 8 Figure 2 8 Selecting an object thickness Depending on the selected conta...

Page 30: ...appear see Fig 2 9 in which you should specify the way of positioning the detector towards the tested object either placed on the surface optimum alternative for measurement or between the two large o...

Page 31: ...rect place the detector as it was selected in the previous step and tap START to run the test see Fig 2 10 If there is a need to change some settings you can return to the window you need using the Ba...

Page 32: ...about the parameters specified in previous windows can be viewed via the About measurement menu item The radiometer features two modes for presenting testing process 1 a basic mode 2 an expert mode 1...

Page 33: ...and in length of time fills from 0 t 100 The indicator will no longer be displayed as soon as 100 is reached Measurement time and pulse intensity from the gamma radiation detector are displayed in the...

Page 34: ...value within their limits The values of specific activity in Bq kg and volume activity in Bq l as well as a current measurement error are represented in the diagram There are such tools available in...

Page 35: ...ples are shown in Figure 2 13 If the band behaves that way during measurement we can see that band edges are more or less symmetric with respect to the horizontal center shown with a red line cursor i...

Page 36: ...means that spectrum balancing processes are not steady yet Figure 2 14 illustrates some examples of the unstable band In order to get more reliable measurement results you should wait until the band b...

Page 37: ...e band reaches an acceptable width You can observe numeric values of maximum and minimum specific activity at the moment of measurement along with its graphic display in order to evaluate the bandwidt...

Page 38: ...nd of the band s upper edge and then shifting it to the lower edge see Figure 2 17 we can observe a numeric value which corresponds to the level of a cursor position In general the line cursor helps t...

Page 39: ...reshold threshold is a red dotted line after about 200 seconds of measurement You should not jump to the conclusion too quickly at the early stage of measurement since the band may go down at the begi...

Page 40: ...th the help of the cursor 2 11 You should keep in mind that the right side of the band gives the most reliable information about the specific activity since it uses all data collected at a given time...

Page 41: ...tivity Thus we can predictably accept a central value of the band as a final measurement result In such a way measurement can be rather time effective but its result should be treated with care and su...

Page 42: ...the band center is a bit beyond the zero line it means either cesium is absent or there is relatively little cesium present The figures will show the following value of specific activity 27 15 15 Bq...

Page 43: ...of specific activity But if you still want to continue measurement in order to get more specific result you should realize that these more specific values are almost always smaller than the upper ban...

Page 44: ...band behavior during long term measurements 2 13 4 The above mentioned features of the band development pattern during measurement can serve the basis for control of the presence or absence of cesium...

Page 45: ...you continue measurement After completing the search for cesium isotopes the window of the basic mode will look as shown in Figure 2 24 a if cesium isotopes in a tested food product are absent or as i...

Page 46: ...se rate measurement touch the Exit Test button While exiting the mode of specific volume activity measurement the application warns you that measured data will be lost If the progress indicator has ac...

Page 47: ...ty evaluation The final window of the mode of specific volume activity measurement with the values of specific and volume activities of cesium isotopes is shown in Figure 2 25 a b c Figure 2 25 Evalua...

Page 48: ...food To view the standardized values of cesium isotopes specific activity touch the STANDARDIZED VALUES button the application provides the values adopted in Japan Specify sanitary standards for cesiu...

Page 49: ...ults To measure background use VIRTUOSO in the mode of gamma radiation dose rate measurement 2 5 2 1 Preparing a food product for testing 1 The food packaging container may be made of any kind of mate...

Page 50: ...each direction Figure 2 27 Recommended container dimensions Ideally the detector should be placed in a position between packages or sacks of food with dimensions of more than 25 cm in any direction f...

Page 51: ...allelepiped like or cylinder like shape If the dimensions of the object exceed ca 25 cm in all directions the shape of the container is of no importance Attention Testing of food products with the dim...

Page 52: ...ainer Figure 2 30 Attaching the detector to the widest side of the container 2 Place the detector with its reference point side labeled with the symbol close to the food The reference point is inscrib...

Page 53: ...se there is some air layer at the package top and the food container is large sized and heavyweight In such a way firstly you can avoid too much pressure on the detector s housing secondly reduce the...

Page 54: ...is not achieved we should understand that the result serves as an estimate This is not a fault of the device but these are the states of the measurement object when the term surface activity becomes...

Page 55: ...t for the presence of cesium isotopes is conducted while the last step evaluates their specific activity The device features two options for presenting test results a basic mode and an expert mode The...

Page 56: ...54 The mode of radioactive cesium surface activity measurement allows testing the following soil types Fertile soil Lawn Marsh soils Sand Crushed stone Asphalt concrete...

Page 57: ...55 2 6 1 Sequence of determining surface activity of radiocesium in soil 2 6 1 1 Selecting a soil type Figure 2 35 Selecting a soil type for testing Tap an icon showing a type of soil to be tested...

Page 58: ...ted during testing The higher the detector the bigger the tested surface area is Select 10 cm height for local testing surface radius up to 1 3 m select 100 cm height for large areas surface radius up...

Page 59: ...ou specified in the previous paragraphs will be listed If the parameters are correct place the detector over the surface at a height selected in the previous step and tap START to begin testing If you...

Page 60: ...absolutely identical to those described in 2 5 1 5 of the mode of specific volume activity measurement 2 6 1 5 Activity evaluation The final window of the surface activity measurement mode with the va...

Page 61: ...lacing the detector above the soil surface 1 Measurement of soil surface activity can yield an accurate result averaged for quite a large area within a radius of tens of meters if a surface of the are...

Page 62: ...check out the size of a tested area If the area is limited in size for example one of its directions does not exceed 3 m or buildings are located within a few meters local measurement performed by pos...

Page 63: ...ume are known in advance or visually obvious Local measurements of obviously contaminated plumes are recommended 4 If there are noticeable holes or bulges in the area but the surface is relatively fla...

Page 64: ...area is ideally flat and smooth it is recommended to make a series of measurements at different points averaged measurements in each 5 10 m while local ones 1 3 m 4 If contamination is known to penetr...

Page 65: ...e natural background The mode of DER measurement from radiocesium can be accessed by tapping the TEST button in the gamma dose rate measurement mode see Fig 2 4 This opens a window shown in Figure 2 4...

Page 66: ...point of the detector location is relatively close to the contaminated objects for example contaminated land buildings plants etc That is we get a generalized answer that this area location room has...

Page 67: ...f explicit radiocesium Spectrum of less explicit radiocesium Figure 2 48 Examples of radiocesium spectrum orange color a characteristic peak of radiocesium 137 yellow color a characteristic peak of ra...

Page 68: ...emission you will see the following view of the FOUND NOT FOUND indicator and DER value mSv h see Fig 2 49 The spectrum will be approximately as follows see Fig 2 50 Figure 2 49 No radiocesium Figure...

Page 69: ...ch the result correction takes place measurement time is prolonged the measurement result will become even more accurate Figure 2 51 Result correction To return to the mode of gamma dose rate measurem...

Page 70: ...portant recommendations for measurement of specific volume activity of naturally occurring radioactive materials Attention Disregarding the guidelines provided below may lead to incorrect measurement...

Page 71: ...ld regardless of the object type stone sand fertile soil etc it is not necessary to put the detector directly to the surface but one may hold it at a certain height up to 1 m If the NORM are uniformly...

Page 72: ...ested object You can place the detector in this mode as follows 1 If the tested object is made up of separate parts boxes packages pieces slabs etc they should be arranged so that there is space to pu...

Page 73: ...ness the measurement result will be somewhat underestimated In case of such measurement it is sufficient to place the detector in any point in the room preferably closer to the center If the detector...

Page 74: ...ode of tracks recording by tapping TRACK in the mode of dose rate measurement see Fig 2 4 A window as in 2 58 a appears which show the current results of gamma dose rate measurement and geographical c...

Page 75: ...on appears which allows finishing track recording and an icon that allows you to continue recording the current track see Fig 2 60 Manual recording icon allows you to save points anytime regardless of...

Page 76: ...74 a b Figure 2 59 Track recording Figure 2 60 Track pausing...

Page 77: ...n the Data section of the open settings window of the program A window opens shown in Figure 2 61 which includes the categories of saved data available for viewing Figure 2 61 Categories of saved data...

Page 78: ...t includes the date and time of recording start see Fig 2 62 The track can be viewed by selecting its name from the list see Fig 2 63 You can specify one or more tracks and perform additional operatio...

Page 79: ...n option to switch to the satellite map view and back with the icon Figure 2 64 Viewing saved tracks on the map of the area Attention The function of gamma results or tests display on the map will wor...

Page 80: ...ata Management in the Data section of the open settings window of the program A window opens shown in Figure 2 61 which includes the categories of saved data available for viewing Select the required...

Page 81: ...icon and Delete icon Figure 2 65 shows a window with marked track records and Figure 2 66 a window of the track export to KMZ file similar additional operations can be performed with gamma results The...

Page 82: ...o KMZ file icon Export to HTML file to generate the report icon and Delete icon The exported HTML report file can be opened via an Internet browser or a specialized program on a smartphone a PC or oth...

Page 83: ...red services A charge may apply for some operations according to your operator tariffs To send the exported report from the Android device to the PC find an HTML file of the required report using the...

Page 84: ...uch the Metrological operations icon Since metrological samples are typically located in the Marinelli vessels this mode is designed for such measurement geometry The detector should be put on the top...

Page 85: ...Help Button 1 shows contextual hints depending on the currently open windows Button 2 opens a menu wherefrom you can switch to the program settings see Fig 2 70 open information about the VIRTUOSO ve...

Page 86: ...racks you can view or change tracks recording parameters see Fig 2 71 namely Enable disable manual point recording Set a time interval for automatic recording of points minimum interval is 1 second ma...

Page 87: ...mation please refer to Section 2 9 You can also switch to the menu of database management see Fig 2 72 wherefrom you can make backup copying restore and clean up the database 4 Calibration switching t...

Page 88: ...DER and counts per second will gradually increase within a whole measurement range of the radiometer After maximum values are achieved minimum values will be displayed again The graphical view of coun...

Page 89: ...o the following 1 Set up an Internet connection in your Android device 2 Go to the VIRTUOSO SP SPEE Sparing Vist Center page on Google Play or run the VIRTUOSO app 3 If the application update is avail...

Page 90: ...OSO radiometer To perform a time effective calibration procedure it is recommended to use potassium containing substances For example purchase the so called potassium chloride fertilizer of 1 kg weigh...

Page 91: ...he detector and Android device until a message of calibration completion appears Important If during calibration the Could not calibrate the detector Potassium was not found message appears try to cha...

Page 92: ...Try to change the detector position for example place the detector as close to a wall of the room as possible or use the potassium chloride fertilizer of 1 kg weight and repeat a calibration The Param...

Page 93: ...ducts 50 Baby nutrition 50 Vegetables grains meat eggs fish etc 100 Food safety standards for cesium isotopes specific activity in Ukraine in accordance with the order of the Ukrainian Ministry of Hea...

Page 94: ...ived radionuclides kBq m 2 137 Cs 400 4000 The level of justification the value of the averted dose is such that the benefits for health from the introduced countermeasure would be less than the damag...

Page 95: ...settlements for construction of underground structures covered with a layer of soil more than 0 5 m thick where long stay of people is not envisaged outside the settlements for construction of roads f...

Page 96: ...ic and production private enterprise Sparing Vist Center PE SPPE Sparing Vist Center 33 Volodymyr Velyky Str Lviv 79026 Ukraine Tel 380 32 242 15 15 multichannel 380 32 242 21 15 multichannel Fax 380...

Page 97: ...95 APPENDIX 1 EXAMPLES OF MEASUREMENT REPORTS VIRTUOSO measurement report with the added geographical coordinates and an option to display data on the map of the area...

Page 98: ...96 b VIRTUOSO measurement report...

Page 99: ...97 VIRTUOSO measurement report...

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