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The flux of environmental neutrons is being studied by activation of metal discs of selected elements. Near the earth's surface the total neutron flux is in the order of 10-2 CM 2s-1, which gives induced activities of a few mBq in the discs. Initial results from this technique, involving activation at ground level for several materials (W, Au, Ta, In, Re, Sm, Dy and Mn) and ultra low-level x-ray spectrometry in an underground laboratory located at 500 m.w.e., are presented. Diffusion of environmental neutrons in water is also measured by activation of gold at different depths.

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Authors: CANET M J M, EC-JRC-IRMM, Retieweg, B-2440 Geel, Belgium;HULT M, EC-JRC-IRMM, Retieweg, B-2440 Geel, Belgium;KOEHLER M, VKTA, Rossendorf, PF 510119, D-01314 Dresden, Germany;JOHNSTON P N, Department of applied Physics, RMIT, G.P.O Box 2476V Melbourne 3001, Australia
Bibliographic Reference: Article: Applied Radiation and Isotopes 52 (2000) pp 711-716
Availability: Elsevier`s website
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