To determine background radiation levels that might influence experiments, we measured in situ gamma-ray emissions at ten locations in the Boulby Underground Laboratory. For gamma radiation in the energy range of 7-2,734 keV, the counts varied from 6.5 to 28 γ s. For measurements inside the Lab, the arithmetic mean was 24 γ s. The sedimentary rocks that surrounded the Lab, halite and mudstone, were characterized by very low activity concentrations of uranium (0.8-7.1 Bq kg) and thorium (0.6-3.9 Bq kg).
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4513908 | PMC |
| http://dx.doi.org/10.1007/s10967-013-2540-9 | DOI Listing |
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