First National Intercomparison of Individual Dosimetry of Photon Radiation in Ukraine
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1 First National Intercomparison of Individual Dosimetry of Photon Radiation in Ukraine Vadim Chumak National Research Center for Radiation Medicine NAMS Ukraine on behalf of N. Deniachenko b, O. Makarovska c, L.-C. Mihailescu d, A.Prykhodko e, V.Voloskyi a and F.Vanhavere d a National Research Centre for Radiation Medicine NAMS Ukraine, Kyiv, Ukraine b Radiation Protection Institute ATS Ukraine, Kyiv, Ukraine c State Nuclear Regulatory Inspection of Ukraine, Kyiv, Ukraine d SCK-CEN, Mol, Belgium e Kyivoblstandartmetrologiya, Byela Tserkva, Ukraine
2 The 1 st National Intercomparison Initiated in 2014 under auspices of the All-state Social Program of Enhancement of the Safety State, Occupational Hygiene and Work Environments for The aim: to cover all certified IDM laboratories in Ukraine Design: in line with the designs of EURADOS intercomparisons (with some deviations) Participation is free for all IDM labs
3 Intercomparison design: starting points Announced test with blind design (irradiation conditions are unknown to participants and coordinator of the intercomparison) Maximum engagement of IDM laboratories of Ukraine Participation is free for IDM laboratories Unbiased and objective judgment Test irradiations in domestic and foreign calibration labs Open discussion of the results Maximum dissemination of the results
4 Intercomparison design allows to: Evaluate ability of laboratories to adequately measure individual doses Evaluate effect of the conditions of irradiation on the results of dosimetry Estimate Type A and Type B uncertainties Estimate linearity of the response Evaluate impact of instrumentation and methodologies
5 Intercomparison design: control over transport/background doses In order to reduce natural background dose: short time for implementation - interval between annealing and readout of dosemeters 37 days (mean), 49 days (max) In order to reduce transport dose: personal delivery of dosimeters by ground transportation
6 Intercomparison design: control over transport/background doses Result: mean transport + natural background dose was about 60 µsv for both Mol and Byela Tserkva and is comparable to the natural background
7 Intercomparison design: securing the glasnost Circular notification and broadcast of information Open feedback from participants Solving open questions by general discussion No anonymity of the participants at the stage of discussion of the results
8 Dosimetric systems Film dosimetry 1 Manual TLD 2 types (three dosemeter types) Semi-automatic TLD 1 Automatic TLD 3 types (five dosemeter types)
9 Evaluation criteria ISO 14146, H o =0.2 msv
10 Summary table for a participant Results for all radiation qualities Total number of irradiated dosemeters: 24 Total number of reported values: 24 Meets ISO criteria: 24 Percentage of the results, which meet the criterion (should be not less that 90%): 100% Does the lab meet ISO performance criteria: YES Results separately for S-Cs seris Total number of irradiated dosemeters: 12 Total number of reported values: 12 Meets ISO criteria: 12 Percentage of the results, which meet the criterion: 100% Relative random error (Type A) at S-Cs source (5 msv): 0.2% Relative systematic error (Type B) at S-Cs source (dose range msv: 13% Mean calibration coefficient at S-Cs source (dose range msv):
11 Trumpet curve for a participant (general)
12 Trumpet curve for a participant (by quality)
13 Mean quotient for a participant by quality
14 Individual quotients for a participant by quality
15 Scatter plot for a participant (all qualities)
16 Scatter plot for a participant (S-Cs)
17 Example of bad results Results for all radiation qualities Total number of irradiated dosemeters: 24 Total number of reported values: 24 Meets ISO criteria: 2 Percentage of the results, which meet the criterion (should be not less that 90%): 8% Does the lab meet ISO performance criteria: NO Results separately for S-Cs seris Total number of irradiated dosemeters: 12 Total number of reported values: 12 Meets ISO criteria: 2 Percentage of the results, which meet the criterion: 17% Relative random error (Type A) at S-Cs source (5 msv): 31.7% Relative systematic error (Type B) at S-Cs source (dose range msv: 66.6% Mean calibration coefficient at S-Cs source (dose range msv):
18 Illustration of some results: performance of film dosimetry
19 Illustration of some results: LiF:Mg, Ti vs. LiF:Mg,Cu,P
20 All results: effect of dosimetry system
21 Summary results (general) Part.code Meets ISO Total results Within trumpet curve % within trumpet curve Min R Max R Min/ Max R Calibration coefficient S- Cs R at 60 msv 21 no % no % Yes % Yes % no % no % Yes % no % no % no % Yes % no % no % Yes % Yes % no % Yes % no % no % Yes % Yes %
22 Summary results (S-Cs) Participant code Meets ISO (general) Meets ISO (S-Cs) Calibration S-Cs % meets ISO (S-Cs) Relative random error at 5 msv 21 no Yes % 1.2% 22 no Yes % 1.9% 23 Yes Yes % 8.7% 24 Yes Yes % 0.2% 31 no Yes % 36.9% 32 no Yes % 4.1% 34 Yes Yes % 3.2% 36 no Yes % 7.7% 38 no no % 19.5% 39 no no % 31.7% 40 Yes Yes % 2.6% 41 no no % 57.8% 42 no Yes % 1.7% 44 Yes Yes % 5.5% 441 Yes Yes % 5.5% 46 no no % 14.9% 47 Yes Yes % 0.4% 49 no no % 38.9% 491 no Yes % 2.8% 50 Yes Yes % 4.6% 51 Yes Yes % 0.8%
23 Effect of dosimetry system Participant code Meets ISO Instrument Dosemeter type Year of manufacturing Metrology lab code 21 no ІФКУ-1 Film (3) TLD-100, 22 no Harshaw element/ (1) 23 Yes Harshaw 6600 TLD-100/8825 (1) 24 Yes Harshaw 6600 Plus TLD-100/ (1) 31 no ДТУ-01 LiF:Mg,Ti (Russia) 1987 (3) 32 no КДТ-02М Al 2 O , 1990 (4) 34 Yes Harshaw 8800 TLD-100/ (1) 36 no ДТУ-01М LiF:Mg,Ti (Russia) 1996 (1) 38 no ДТУ-01 LiF:Mg,Ti (Russia) 1995 (3) 39 no КДТ-02М Al 2 O (3) 40 Yes КДТ-02М Al 2 O (1) 41 no ДТУ 01 (3) 42 no ДВГ-02ТМ LiF:Mg,Ti (Russia) 2009 (2) 44 Yes ДТУ-01 LiF:Mg,Ti (Russia) 1990 (1) 441 Yes ДТУ-01 LiF:Mg,Ti (Russia) 1990 (1) 46 no ДТУ-01М LiF:Mg,Ti (Russia) 2007 (1) 47 Yes RE-2000 LiF:Mg,Cu,P 2008 (2) 49 no RE-2000 LiF:Mg,Ti (Russia) 2006 (2) 491 no RE-2000 LiF:Mg,Ti (Russia) 2006 (2) 50 Yes RE-2000 LiF:Mg,Cu,P 2006 (1) TLD-100, 51 Yes Harshaw element/ (1)
24 Distribution of results by the number of monitored persons
25 Conclusions The results of the 1 st National Intercomparison proved to be very educative: ISO criteria are met by 8 of 18 laboratories (9 of 19 dosimetry systems) 55% of occupationally exposed personnel receives high quality IDM About 3,000 individuals get IDM of catastrophic quality There is a strong demand for continuation of the intercomparison exercises at national and international levels
26 Thank you!
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