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Count-loss effect in subcriticality measurement by pulsed neutron source method, 2; Proposal for utilization of neutron detection system operated in current mode

パルス中性子源法による未臨界度測定における計数ロス効果,2; 電流モードで使用する中性子検出システムの利用の提案

北村 康則; 福島 昌宏

Kitamura, Yasunori; Fukushima, Masahiro

It was pointed out in the previous paper that the neutron decay constant determined by the pulsed neutron source method that employs the neutron detection system operated in the pulse mode is expected to be biased owing to the count-loss effect even when the intensity of pulsed neutron source is not high. To avoid this difficulty, by paying attention to the current mode that is inherently free from the count-loss process, the pulsed neutron source method with neutron detection system operated in the current mode was proposed. Using this method, not only the neutron decay constant but also the absolute value of subcriticality are obtained when a proper time constant of neutron detection system is selected.

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