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Count-loss effect in subcriticality measurement by pulsed neutron source method, 1; Investigation on count-loss effect in determination of neutron decay constant

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,1; 中性子減衰定数評価における計数ロス効果の検討

北村 康則; 福島 昌宏

Kitamura, Yasunori; Fukushima, Masahiro

The count-loss effect in determination of neutron decay constant by pulsed neutron source method was investigated. It was found that overestimation of neutron decay constant due to count-loss effect is seen while underestimation appears superiorly as the intensity of pulsed neutron source is getting higher. It was further demonstrated that the well-known count-loss correction procedures are not effective for overestimation although they suppress underestimation. Therefore, the pulsed neutron source method should be modified so as to have robustness against the count-loss effect.

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