Freitas M C, De Corte F
Instituto Nacional de Engenharia e Technologia Industrial (INETI), Departamento de Química, Sacavém, Portugal.
Biol Trace Elem Res. 1994 Fall;43-45:691-6. doi: 10.1007/BF02917373.
As part of a recent study on the environmental effects caused by the operation of a coal-fired power station at Sines, Portugal, k0-based instrumental neutron activation analysis (INAA) was used for the determination of the lanthanides (and also of tantalum and uranium) in plant leaves and lichens. In view of the accuracy and sensitivity of the determinations, it was advantageous to make use of a low-energy photon detector (LEPD). To begin with, in the present article, a survey is given of the former developments leading to user-friendly procedures for detection efficiency calibration of the LEPD and for correction for true-coincidence (cascade summing) effects. As a continuation of this, computer coincidence correction factors are now tabulated for the relevant low-energetic gamma-rays of the analytically interesting lanthanide, tantalum, and uranium radionuclides. Also the 140.5-keV line of 99Mo/99mTc is included, molybdenum being the comparator chosen when counting using an LEPD.
作为最近一项关于葡萄牙锡尼什一座燃煤发电站运行所造成环境影响研究的一部分，基于k0的仪器中子活化分析（INAA）被用于测定植物叶片和地衣中的镧系元素（以及钽和铀）。鉴于测定的准确性和灵敏度，使用低能光子探测器（LEPD）是有利的。首先，在本文中，概述了以前为实现LEPD探测效率校准和真符合（级联求和）效应校正的用户友好程序所取得的进展。在此基础上，现在列出了分析中感兴趣的镧系元素、钽和铀放射性核素相关低能γ射线的计算机符合校正因子。此外，还包括99Mo/99mTc的140.5keV谱线，在使用LEPD进行计数时，钼是选定的比较器。
