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Aug 06, 2023 155 likes •436 views

Update on IA IAEA profic iciency te test exe xercises Arend Harms and Iolanda Osvath IAEA Environment Laboratories Monaco IAEA International Atomic Energy Agency 2015 IA IAEA pro roficiency test exe xercise (in (introduction) 2015

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IAEA

International Atomic Energy Agency

Update on IA IAEA profic iciency te test exe xercises

Arend Harms and Iolanda Osvath IAEA Environment Laboratories Monaco

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2015 IA IAEA pro roficiency test exe xercise (in (introduction)

  • 2015 IAEA proficiency test exercise organised in cooperation

with the Nuclear Regulation Authority (Japan)

  • 26 participants, including 7 from HELCOM contracting parties

Estonia Finland Germany Poland the Russian Federation Sweden

  • 10 participants from Japan
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2015 IA IAEA pro roficiency test exe xercise (s (samples)

Samples supplied containing 5 L of Mediterranean sea water spiked with known amounts of H-3, Sr-90, Cs-134 and Cs-137 Suggested analytical method H-3: Distillation and liquid scintillation counting Sr-90: Ca/Sr precipitation followed by extraction and/or chromatography and LSC or GF-proportional counting Cs-134 and Cs-137:

  • Either direct gamma spectrometry (GS) or
  • adsorption on (NH4)3PO4Mo12O36 or Cu2[Fe(CN)6] and GS
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2015 IA IAEA pro roficiency test exe xercise (a (assigned valu lues)

Individual unique sea water samples prepared separately. Traceable massic activities in samples: H-3: : (3.14 - 3.22) Bq kg-1 Sr Sr-90 90: (0.1001 - 0.1027) Bq kg-1 Cs Cs-134: (0.1531 - 0.1571) Bq kg-1 Cs Cs-137: (0.2027 - 0.2080) Bq kg-1

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Evalu luation of f re results (T (Test I) I)

𝑆𝑓𝑚𝑏𝑢𝑗𝑤𝑓 𝑐𝑗𝑏𝑡 = 𝑊𝑏𝑚𝑣𝑓𝐵𝑜𝑏𝑚𝑧𝑡𝑢 − 𝑊𝑏𝑚𝑣𝑓𝐽𝐵𝐹𝐵 𝑊𝑏𝑚𝑣𝑓𝐽𝐵𝐹𝐵 × 100%

3H and 90Sr

If absolute value of relative bias < 25%: “Pass”

  • therwise:

“Fail”

134Cs and 137Cs

If absolute value of relative bias < 20%: “Pass”

  • therwise:

“Fail”

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Evalu luation of f re results (t (two additional Tests II II and II III) I)

A1 ≤ A2 where: 𝐵1 = 𝑊𝑏𝑚𝑣𝑓𝐽𝐵𝐹𝐵 − 𝑊𝑏𝑚𝑣𝑓𝐵𝑜𝑏𝑚𝑧𝑡𝑢 𝐵2 = 2.58 × 𝑣𝑜𝑑𝐽𝐵𝐹𝐵

2

+ 𝑣𝑜𝑑𝐵𝑜𝑏𝑚𝑧𝑡𝑢

2

P P < < 25 25% (f (for 3H an and 90

90Sr) or P

< < 20 20% ( % (134

134Cs an

and 137

137Cs)

where: 𝑄 = 𝑣𝑜𝑑𝐽𝐵𝐹𝐵 𝑊𝑏𝑚𝑣𝑓𝐽𝐵𝐹𝐵

2

+ 𝑣𝑜𝑑𝐵𝑜𝑏𝑚𝑧𝑡𝑢 𝑊𝑏𝑚𝑣𝑓𝐵𝑜𝑏𝑚𝑧𝑡𝑢

2

× 100%

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Evalu luation

Tes est t I.

  • I. Rel

elati tive bia bias tes test: Pas ass or

  • r Fa

Fail il Test II. Zeta score Pass or Fail Test III. Precision test Pass or Fail Test I Test II Test III Final evaluation Pass Pass Pass Accepted Pass Fail Pass Warning Pass Pass Fail Warning Fail Pass/Fail Pass/Fail Not Accepted

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Evalu luation

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H-3 3 (a (all ll participants)

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H-3 3 (H (HELCOM)

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H-3 3 (H (HELCOM)

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Sr Sr-90 (a (all l participants)

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Sr Sr-90 (H (HELCOM)

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Sr Sr-90 (H (HELCOM)

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Cs Cs-134 (a (all ll participants)

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Cs Cs-134 (H (HELCOM)

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Cs Cs-134 (H (HELCOM)

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Cs Cs-137 (a (all ll participants)

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Cs Cs-137 (H (HELCOM)

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Cs Cs-137 (H (HELCOM)

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Overview

H-3 Sr-90 Cs-134 Cs-137 All (81 results) Acceptable 11 12 17 23 Warning 1 4 Not Acceptable 4 1 5 3 HELCOM (23 results) Acceptable 2 5 2 7 Warning 2 Not Acceptable 2 3

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Comparison between data sets (Bq Bq kg kg-1) )

H-3 Sr-90 Assigned value 3.205  0.023 0.1020  0.0008 HELCOM 3.7  0.3 0.1022  0.0020 Bias 16% 0.2% Significant? No No Assigned value 3.184  0.020 0.1014  0.0008 All par arti ticipants 3.09  0.04 0.1023  0.0013 Bias

  • 2.9%

1.0% Significant? No No

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Comparison between data sets (Bq Bq kg kg-1)

Cs-134 Cs-137 Assigned value 0.1556  0.0012 0.2060  0.0015 HELCOM 0.141  0.006 0.206  0.005 Bias

  • 9.6%
  • 0.2%

Significant? No No Assigned value 0.1547  0.0011 0.2048  0.0014 All par arti ticipants 0.1488  0.0024 0.208  0.003 Bias:

  • 3.8%

1.5% Significant? Yes No

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Overview HELCOM in in PTEs 2012 2012-2015 2015

2015 2014 2013 2012 Accepted 70 70% 70% 80% 100% Warning 9% 15% 15% 0% Not Accepted 22 22% 15% 5% 0% Participants 7 6 7 2 Results 23 23 20 20 4 Radionuclides 4 4 3 2

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HELCOM Cs-134 in in PTEs 2012 2012-2015

2015 2014 2013 2012 Accepted 29 29% 67% 86% 100% Warning 29 29% 0% 14% 0% Not Accepted 43 43% 33% 0% 0% Results 7 6 7 2 Bias

  • 9.6%
  • 9.2%
  • 1.4%
  • 10%

Bias significant? No No Yes No No

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Conclu lusion

Some participants seem not to make sufficient correction for coincidence summing (signal loss -> underestimation of the Cs-134 activity level) Spread in the reported relative uncertainties (at k =1): All participants HELCOM H-3: 1.8% - 33% 10% - 23% Sr-90: 2.2% - 20% 2.6% - 20% Cs-134: 4.8% - 23% 4.9% - 15% Cs-137: 3.0% - 15% 4.6% - 15%

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Acknowledgements

Many thanks to the participants for submitting their results Special acknowledgements to our IAEA colleagues Mai Pham and Oxana Blinova for technical assistance The IAEA is grateful to the Government of the Principality of Monaco for the support provided to its Environment Laboratories