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放射性核素寿命计算方法的模拟研究

Nuclear Physics Review(2020)

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Abstract
根据几种常用放射性核素的寿命计算方法,通过模拟数据研究了直接拟合法、对数时间法、极大似然法、观测时间受限时的极大似然法等四种寿命计算方法的适用范围.当观测时间不受限时,研究了在不同计数下寿命计算方法的适用范围.当观测时间受限时,研究了在不同观测时间窗口下寿命计算方法的适用范围.模拟中选用全剥离离子94mRu44+作为目标核素,得到了不同计数及不同观测时间窗口下的寿命及其误差,并给出了四种方法的适用范围.94mRu44+寿命的模拟结果与在兰州等时性质量谱仪上获得的实验结果在一倍标准偏差范围内一致,从而进一步验证了寿命计算方法的适用范围及模拟数据的可靠性.该模拟结果可为寿命测量实验设计提供理论依据和参考.
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