Havelka Miroslav, Sochorová Jana
Czech Metrology Institute, Inspectorate for Ionizing Radiation, Prague, Czech Republic.
Appl Radiat Isot. 2010 Jul-Aug;68(7-8):1330-4. doi: 10.1016/j.apradiso.2009.12.029. Epub 2009 Dec 21.
Activities of the radionuclides (124)Sb and (152)Eu were determined by the efficiency extrapolation method applied to 4pi(PC)-gamma coincidence counting. The (124)Sb sources were prepared from a solution with the chemical form of 50 microg g(-1) SbCl(3) in 2 M HCl. To inhibit the volatility of antimony chlorides, the sources were slowly dried in a H(2)S atmosphere with relative humidity of 76% for about 48 h. This procedure increased the beta detection efficiency up to 0.98, which simplified the standardisation. In the (152)Eu standardisation, the optimal gamma-ray energy window setting to achieve a linear dependency and the correct slope of the extrapolation curve were derived by means of software coincidence counting system using offline evaluation of data with different coincidence parameter settings. The results obtained by the software coincidence counting system were compared with those obtained by the conventional coincidence method.
通过应用于4π（PC）-γ符合计数的效率外推法测定了放射性核素（124）Sb和（152）Eu的活度。（124）Sb源由化学形式为50μg g⁻¹ SbCl₃于2 M HCl中的溶液制备。为抑制氯化锑的挥发性，将源在相对湿度为76%的H₂S气氛中缓慢干燥约48小时。此程序将β探测效率提高至0.98，简化了标准化过程。在（152）Eu标准化中，借助软件符合计数系统，通过对具有不同符合参数设置的数据进行离线评估，得出实现线性相关性和外推曲线正确斜率的最佳γ射线能量窗设置。将软件符合计数系统获得的结果与传统符合方法获得的结果进行了比较。
