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在使用替代光学模型的三倍到两倍巧合比率 (TDCR) 方法中描述弹道依赖

Romain Coulon¹, Camille Queruel², Christophe Bobin²

¹Bureau International des Poids et Mesures, Pavillon de Breteuil, Sèvres, Cedex, F-92312, France.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|September 25, 2025

概括

三倍到两倍的巧合比率 (TDCR) 方法.

科学领域:

核物理与仪器仪表核物理与仪器仪表
放射化学和测量科学放射化学和测量科学

背景情况:

三倍到两倍的巧合比率 (TDCR) 方法是液体闪光计数中绝对活动测量的标准.
目前的模型假设独立的光子检测,忽略了闪电器内的空间效应.

研究的目的:

调查弹道依赖TDCR测量的影响.
分析光子检测概率如何受到衰变事件位置的影响.

主要方法:

用了一个替代的二维光学模型来分配光子流量.
将发现集成到Poisson-Multinomial-Binomial等级模型中,用于TDCR光学模拟.

主要成果:

弹道依赖减少了双倍和三倍的巧合数,降低了TDCR值.
低能发射器 (如55Fe,51Cr) 尤其受到影响.
增加光学扩散可以减轻弹道依赖的影响.

结论:

弹道的依赖性显著影响TDCR的准确性,特别是对于低能辐射.
最大化光子扩散对于准确的TDCR测量至关重要.
需要改进的TDCR模型,包括光学传输模拟.

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