|ISBN (pdf):||978-952-11-4527-8|| |
|Julkaisusarja ja numero:||Reports of the Finnish Environment Institute 33/2015|| |
|Kustantaja:||Finnish Environment Institute|| |
|Saatavuus (pdf):||http://hdl.handle.net/10138/156329|| |
|Tekijät:||Katarina Björklöf; Reko Simola; Mirja Leivuori; Keijo Tervonen; Sari Lanteri; Markku Ilmakunnas; Ritva Väisänen
Proftest SYKE in co-operation with the Radiation and Nuclear Safety Authority (STUK) carried out the proficiency test (PT) for the measurement of radon in groundwater in May 2015. 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). In total 34 participants took part in this PT. Fourteen of the participating laboratories used the liquid scintillation method and 23 used equipment based on gamma spectrometry (Radek MKGB-01). In total 88 % of the results were satisfactory when allowing for 10-25 % variation. This is the same level as in previous round in 2013. 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. The results obtained with Radek equipment was systematically about 10 % smaller that results obtained with liquid scintillation technology.