Abstract
The results of measuring the gamma background radiation in Lab 5 of the underground facility in the Pyhäsalmi Mine at a depth of 1410 m are presented. The background integral count rate per kg of germanium of the HPGe-detector was 0.028 s-1 × kg-1. After purging the measuring chamber with nitrogen gas at a rate of 0.15 L/h the count rate was reduced to 0.021 s-1 × kg-1.
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