In situ gamma-ray measurements were taken at six locations in the Modane Underground Laboratory. Count rates for gamma radiation within the energy range of 7-2734 keV varied from 15 to 108 γs. The arithmetic mean was 79 γs for measurements taken without a collimator. The metamorphic rocks surrounding the Lab are characterized by low activity concentrations of uranium and thorium equal to 12 and 10 Bq kg, respectively.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4514586 | PMC |
| http://dx.doi.org/10.1007/s10967-011-1497-9 | DOI Listing |
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