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Correction of count-loss effect in neutron correlation methods that employ single neutron counting system for subcriticality measurement

1系統の中性子計数系を用いる中性子相関法における未臨界度測定のため計数ロス効果補正

北村 康則; 福島 昌宏

Kitamura, Yasunori; Fukushima, Masahiro

It is well-known that the count-loss effect causes a serious difficulty to the neutron correlation methods that employ a single neutron counting system, e.g., the variance-to-mean and the auto-correlation methods, since it deteriorates the information extracted from the subcritical reactor system. New formulae of variance-to-mean and auto-correlation methods were hence obtained on the basis of a rigorous theoretical approach for treating the count-loss process. It is expected that the present formulae work better than conventional ones for determination of neutron decay constant.

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