CR-39およびIn箔検出器による医療用リニアックからの中性子線の測定とその実用性の検討

概要

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It is now evident that a considerable amount of photoneutrons are produced in a medical electron linac ranging from 10-15 MeV which is commonly used in our country. We have measured the thermal and fast neutron dose in both 10 and 15MV photon modes using the indium foil activation method and the etch pit method employing a CR-39 plastic track recorder. Leakage radiation dose levels outside the treatment room have also been measured with a remcounter and a photon survey meter. In this paper, the results of the measurements are presented and the feasibility of these methods is discussed. In view of the advantageous characteristics of the CR-39 detector such as sensitivity to low energy neutrons, photon insensitivity, flat response and almost no fading, and the fact that only simple setups and measuring techniques are required, the etch pit method using the CR-39 was found to be a practical means for measuring fast neutrons accompanying an X-ray beam of a medical accelerator.
公益社団法人日本放射線技術学会の論文
1983-05-01