| 摘要 |
PURPOSE:To enable an accurate evaluation of radioactivity of solid radioactive wastes by comparing neutron strength calculated from a solid radioactive waste with actually measured neutron intensity of the waste. CONSTITUTION:First of all, by utilizing actually measured tau ray strength, for instance, neutron intensity emitted from an object solid radioactive waste is calculated, under the condition that radioactivity is uniform inside the solid radioactive waste. On the other hand, the intensity of neutrons emitted from alphanuclides is actually measured, too, and the both neutron intensities are compared with each other. When the both neutron intensities have the same value, it is judged that the radioactivity is uniform inside the solid radioactive waste and therefore the actually measured tau ray intensity is taken as an index showing the radioactivity of whole solid radioactive waste. When the both neutron intensities are substantially different from each other, it is judged that the radioactivity is not uniform inside the solid radioactive waste and therefore, through adjustment of the actually measured tau ray intensity, based upon difference between the both neutron intensities, a tau ray intensity when the radioactivity is uniform inside the radioactive waste, is obtained.
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