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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Accurate activity measurement of Lu-177 by the liquid scintillation 4πΒ-γ coincidence counting technique
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Accurate activity measurement of Lu-177 by the liquid scintillation 4πΒ-γ coincidence counting technique

机译：液体闪烁4πΒ-γ符合计数技术准确测量Lu-177的活度

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摘要

This paper reports on absolute measurements made at the NMISA by the 4π[LS]Β-γ coincidence extrapolation technique, which formed part of a key comparison of activity measurements of the radionuclide lutetium-177, a beta-gamma emitter. A detection efficiency analysis based on the decay scheme indicated that the coincidence extrapolation method is feasible for extracting the source disintegration rate of 177Lu. A simulation was undertaken utilizing the efficiency equations to give an indication of the expected variation of the source count rate with efficiency for different gamma-ray windows. Both the simulation and experiment indicated that the window giving the highest counting efficiency was centered about the 208.4keV photopeak, with the data showing linear variation in the upper efficiency range. The extracted activity concentration of the 177Lu solution proved to be highly accurate, being higher than the proposed comparison reference value by 0.15%, well within one standard uncertainty (σ=0.26%) as specified by the NMISA.
机译：本文报道了通过4π[LS]Β-γ重合外推技术在NMISA进行的绝对测量，这是放射性核素177（β-γ发射体）活度测量的关键比较的一部分。基于衰减方案的检测效率分析表明，符合外推法可用于提取177Lu的源崩解率。利用效率方程式进行了仿真，以表明不同γ射线窗口的光源计数率随效率的预期变化。仿真和实验均表明，提供最高计数效率的窗口以208.4keV光电峰值为中心，数据显示出较高效率范围内的线性变化。事实证明，177Lu溶液的萃取活性浓度非常准确，比拟议的比较参考值高出0.15％，完全在NMISA规定的一个标准不确定度内（σ= 0.26％）。

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