動的予測によるサーベイメータ応答の高速化

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  • Quick Response of a Survey Meter by a Dynamic Prediction Method
  • ドウテキ ヨソク ニ ヨル サーベイ メータ オウトウ ノ コウソクカ

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A survey meter is an indispensable radiation detector for monitoring radioactive contamination in case of radiation accidents, and it is used as typical equipment in daily radiation measurement and control at radiation facilities. The survey meter measures count rate (min-1, cpm) . In general, about 30 seconds per each place is necessary for the measurement by using the survey meter with the time constant of 10 seconds, and the time of about 60 seconds per each place is necessary for a more accurate measurement. Therefore measurement at many places takes a lot of time and compels heavy labor to radiation workers. However a quick response is especially important for emergency. In order to solve these problems, the method, which predicts the final value at the initial stage without waiting for the final response, has been proposed. The method treats the condition that the time constant of the survey meter is given, and also the condition that the survey meter is scanned for finding surface contamination. Experiments were carried out using a 90Sr/90Y source, 133Ba source and a 60Co source. The results show that the principle of the method has been confirmed and the final response can be predicted with reasonable accuracy.

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