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NKS Programme Area:
NKS-B
Research Area:
Measurement Strategy, technology and QA
Report Number:
NKS-19
Report Title:
NKS 1999 intercomparison of measurements of radioactivity
Activity Acronym:
BOK-1
Authors:
Christian Lange Fogh
Abstract:
34 laboratories have returned radioactivity measurements on six different environmental
samples. The samples were analysed for their content of gamma emitters, Sr-90, transuranics
and Tc-99. The samples materials are described and the results presented. Some
scatter was observed in measurements of Cs-137 in low-level samples such as dry milk,
meat and hay. The scatter was less pronounced for sediments and seaweed material that
had higher levels of radioactivity. In general, the most of the results were consistent with a
few laboratories reporting outlying values. An exception was seawater where no clear
agreement could be found for the activity of Cs-137.