Survey and countermeasures on radiocesium inflow into a laboratory building for radioactivity analysis

Abstract

 In 2012, JAEA has established a laboratory in Fukushima-city to implement radioactivity analysis of environmental samples. Key nuclides measured in this laboratory are ¹³⁴Cs and ¹³⁷Cs (radiocesium). For the purpose, situation of radiocesium inflow into the laboratory building and its effects on the analyses were investigated based on the gamma-spectrometry with germanium detectors. As a result, the surface densities of radiocesium in the laboratory was found to be far below the minimum detectable activities of survey instruments routinely used for the radiation control purposes.