|ISBN (pdf):||978-952-11-4852-1|| |
|Julkaisusarja ja numero:||Reports of the Finnish Environment Institute 22/2017 || |
|Kustantaja:||Suomen ympäristökeskus|| |
|Saatavuus (pdf):||http://hdl.handle.net/10138/199819|| |
|Tekijät:||Björklöf, Katarina; Simola, Reko; Leivuori, Mirja; Tervonen, Keijo; Lanteri, Sari; Ilmakunnas, Markku || |
In May 2017 Proftest SYKE carried out the proficiency test (PT) for analysis of radon in ground water (Rn 05/2017) in cooperation with the Finnish Radiation and Nuclear Safety Authority (STUK) for laboratories conducting radon-222 measurements in ground water. In total, 29 participants took part in the proficiency test.
Two ground water samples were tested, in which one contained high radon concentration (1000–5000 Bq/l) and the other contained lower concentration of radon (<1000 Bq/l). Eleven of the participating laboratories used the liquid scintillation method and 21 used equipment based on gamma spectrometry. The mean of the results measured by STUK with the liquid scintillation counting was used as the assigned value for radon concentration. The evaluation of the results was based on z scores. In total 78 % of the results were satisfactory when allowing for 17-25 % variation. This is slightly poorer performance than in the previous round in 2015.
A warm thank you to all the participants of this proficiency test.