Evaluation of the radioactivity in concrete from accelerator facilities |
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Authors: | Q B Wang K Masumoto K Bessho H Matsumura T Miura T Shibata |
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Institution: | (1) Institute of High Energy Physics (IHEP), The Chinese Academy of Sciences, Beijing, 100039, P.R. China;(2) High Energy Accelerator Research Organization (KEK), Tokyo, Japan |
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Abstract: | For evaluation of radioactivity induced in the concrete samples from accelerator facilities, the residual radioactivity in
concrete sample, collected from seven accelerator facilities, was determined by γ-ray spectrometry. The tritium was extracted
by the heating method using an IR furnace, and measured with a liquid scintillation counter. It was found that the major radioisotopes
activated mainly by neutrons in the concrete samples were 152Eu, 60Co, 134Cs and 3H. The concentrations of radioactivities induced by thermal neutron capture are the highest at a depth of 10 cm in the concrete
wall. The correlation between tritium, 60Co and 152Eu activity was investigated by measuring many concrete samples for seven accelerator facilities. The results indicate that
their activities are strongly correlated with each other. So it would also be concluded that the total activity in shielding
concrete could be estimated on the basis of the activities of 60Co and 152Eu. |
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