El-Taher A
Physics Department, Faculty of Science, Al-Azher University, Assuit Branch Assuit, Egypt.
Appl Radiat Isot. 2010 Sep;68(9):1859-63. doi: 10.1016/j.apradiso.2010.02.012. Epub 2010 Feb 25.
Twenty representative geological samples (tonalite, granodiorite, adamellite, syenogranite, rapakivi syenogranite, alkali feldspar granite and monzogranite) were collected from G. Kattar area in Eastern Desert, Egypt, for analysis by instrumental neutron activation as a sensitive nondestructive analytical tool for the determination of 14 rare earth elements (REEs) and to find out the following: (1) what information could be obtained about the REEs and distribution patterns of REEs in geological samples under investigation, (2) to estimate the accuracy, reproducibility and detection limit of the INAA method in case of the given samples. The samples were properly prepared together with standard reference material and simultaneously irradiated in a neutron flux of 7x10(11)n/cm(2)s in the TRIGA Mainz research reactor facilities. The gamma spectra were collected by an HPGe detector and the analysis was done by means of a computerized multichannel analyzer. The choice of the nuclear reaction, irradiation and decay times, and of the proper gamma radiation in counting are presented and discussed. The results are found to be in good agreement with certified values.
从埃及东部沙漠的G. Kattar地区采集了20个具有代表性的地质样本（英云闪长岩、花岗闪长岩、二长花岗岩、正长花岗岩、环斑正长花岗岩、碱性长石花岗岩和二长花岗岩），用于通过仪器中子活化分析，这是一种用于测定14种稀土元素（REEs）的灵敏无损分析工具，目的是弄清楚以下几点：（1）关于所研究地质样本中的稀土元素及其分布模式能获得哪些信息，（2）在给定样本的情况下估算仪器中子活化分析方法的准确性、重现性和检测限。这些样本与标准参考物质一起妥善制备，并在美因茨TRIGA研究堆设施中以7×10(11)n/cm(2)s的中子通量同时进行辐照。用高纯锗探测器收集伽马谱，并通过计算机化多道分析仪进行分析。介绍并讨论了核反应、辐照和衰变时间以及计数中合适伽马辐射的选择。结果发现与认证值高度一致。
