Nähle O, Kossert K, Cassette P
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany.
Appl Radiat Isot. 2010 Jul-Aug;68(7-8):1534-6. doi: 10.1016/j.apradiso.2009.11.057. Epub 2009 Dec 3.
A triple-to-double coincidence ratio (TDCR) liquid scintillation counting system (Pochwalski et al., 1988; Grau Malonda and Coursey, 1988) was set up at the Physikalisch-Technische Bundesanstalt (PTB) to be used as an additional technique for primary activity standardization. The optical chamber of the system was designed in our laboratory, expending great effort to achieve maximum light transmission to the photomultiplier tubes (PMT) and, consequently, a maximum counting efficiency and low uncertainties. A programme to compute the counting efficiencies and to analyse the measurement data was developed and tested. The software can also be used to allow for PMT asymmetries. The system and recently developed analysis procedures were used for the activity standardization of a tritiated water solution within the scope of an international comparison under the auspices of the Bureau International des Poids et Mesures (BIPM).
德国联邦物理技术研究院（PTB）建立了一个三重符合与双道符合比（TDCR）液体闪烁计数系统（波赫瓦尔斯基等人，1988年；格劳·马隆达和考西，1988年），用作初级活度标准化的附加技术。该系统的光学腔室是在我们实验室设计的，付出了巨大努力以实现向光电倍增管（PMT）的最大光传输，从而达到最大计数效率和低不确定度。开发并测试了一个用于计算计数效率和分析测量数据的程序。该软件还可用于考虑光电倍增管的不对称性。在国际计量局（BIPM）的主持下，该系统和最近开发的分析程序被用于在国际比对范围内对氚化水溶液进行活度标准化。
