Sahagia Maria, Ivan C, Grigorescu E L, Capogni M, De Felice P, Fazio A
National Institute of R&D for Physics and Nuclear Engineering Horia Hulubei, IFIN-HH, POB MG-6, Bucharest RO-76900, Romania.
Appl Radiat Isot. 2004 Feb-Apr;60(2-4):423-7. doi: 10.1016/j.apradiso.2003.11.053.
A 65Zn solution was standardized by the 4piPC-gamma efficiency-extrapolation coincidence counting method. Theoretical aspects of coincidence equations, efficiency equations and linearity conditions are reviewed. Experimental measurements were performed for two low level discrimination thresholds for the PC channel (counting K+L or K X-rays or Auger electrons from EC decay) and for three different settings of the gamma window. Requirements on gamma channel set-up for linear extrapolation were established by using a Pb absorber or by proper gamma window setting. The measured activity values were discussed and found in good agreement with those obtained with a calibrated ionization chamber.
用4πPC-γ效率外推符合计数法对65Zn溶液进行了标准化。回顾了符合方程、效率方程和线性条件的理论方面。针对PC通道的两个低水平判别阈值（计数来自电子俘获衰变的K+L或K X射线或俄歇电子）以及γ窗口的三种不同设置进行了实验测量。通过使用铅吸收体或通过适当设置γ窗口，确定了线性外推对γ通道设置的要求。对测量的活度值进行了讨论，发现与用校准电离室获得的值非常一致。
