Quenching Correction with Two-Dimensional Scintillation Spectrum in Tritium Measurement
Quenching Correction with Two-Dimensional Scintillation Spectrum in Tritium Measurement
复制标题
氚测量中二维闪烁光谱淬火校正
DOI：
10.1080/15361055.2019.1661720
复制
发表时间：
2019
影响因子：
0.9
通讯作者：
Aso Tsukasa
中科院分区：
文献类型：
--
作者：
Hara Masanori;Shoji Miki;Aso Tsukasa
液体闪烁计数器(LSCs)已被广泛用于低水平氚测量。为了使用LSC获得准确的氚活度，需要进行猝灭校正。猝灭发生在闪烁过程的中断(化学猝灭)和有色物质对闪烁光子的吸收(颜色猝灭)。对于颜色猝灭的校正，目前还没有通用的方法。在这里，二维(2-D)闪烁光谱是用连接到外部多道分析仪的常规LSC测量的。LSC有两个光电倍增管(PMT)。从两个PM的脉冲高度构建了一个二维谱。在不那么猝灭的鸡尾酒中，二维闪烁光谱沿着45度线延伸。然而，光谱的形状随着颜色猝灭的增加而展宽，从而提供了关于颜色猝灭的信息。在氚计数效率与猝灭指数参数之间的关系中，颜色猝灭的影响不是很显著。
Liquid scintillation counters (LSCs) have been widely used for low-level tritium measurements. To obtain an accurate tritium activity using a LSC, a quenching correction is required. The quenching occurs from interruptions to the scintillation process (chemical quenching) and by absorption of scintillation photons by colored substances (color quenching). There is no common method for the correction of color quenching. Here, two-dimensional (2-D) scintillation spectra were measured with a conventional LSC connected to an external multichannel analyzer. The LSC had two photomultiplier tubes (PMTs). A 2-D spectrum was constructed from pulse heights from both PMTs. In a less-quenching cocktail, the 2-D scintillation spectra extended along a 45-deg line. However, the shape of the spectrum broadened with increasing color quenching and thus gave information about the color quenching. The effect of color quenching was qualitatively less significant in the relationship between the tritium counting efficiency and the quenching index parameter.