Mjm. Canet et al., Measurements of activation induced by environmental neutrons using ultra low-level gamma-ray spectrometry, APPL RAD IS, 52(3), 2000, pp. 711-716
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(-2)s(-1), which gives induced activities of a
few mBq in the discs. Initial results from this technique, involving activ
ation at ground level for several materials (W, Au, Ta, In, Re, Sm, Dy and
Mn) and ultra low-level gamma-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, (C) 20
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