イメージングプレートによる岩石からのRn-α線の検出

概要

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The emanation of radon from rock samples was detected using an imaging plate, which acts as a highly sensitive two-dimensional radiation sensor. Radon alpha-rays, including alpha disintegration of thoron and their daughter nuclides, are measurable using the imaging plate technique. The semi-quantitative dose of alpha-rays from radon families is evaluated by counting the number of high level PSL spots within a region of interest (for the case of low level dose). The PSL value per unit area is appropriate for a high level dose, where the PSL has unique dose units and quantities in the imaging plate system. The main alpha radiation source for radon families, in the case for a short emanation pathway (i.e. close to the source), is considered to be thoron, but it is inferred to be predominantly radon if applying the imaging plate further from the rock sample. Modification of this technique allows the two-dimensional measurement of radon alpha-rays emanating from a rock mass, and this may be applied to estimating radon emanation through fractures.
社団法人資源・素材学会の論文
2000-06-25