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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >NONDESTRUCTIVE ELEMENTAL ANALYSIS OF COINS USING ACCELERATOR-BASED THERMAL NEUTRONS
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NONDESTRUCTIVE ELEMENTAL ANALYSIS OF COINS USING ACCELERATOR-BASED THERMAL NEUTRONS

机译：基于加速器的热中子对硬币的非破坏性元素分析

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摘要

The accelerator-based thermal-neutron activation analysis setup at KFUPM has an adequate thermal-neutron flux that can be advantageously used for the elemental analysis of a variety of samples including archaeological ones. The thermal neutrons are derived from the moderation of fast neutrons from the D(d,n)~3He reaction which produces fast 2.5 MeV neutrons. A maximum thermal flux of about 2.5 x 10~6 n/cm~2-s was achieved. For the purpose of determining the suitability of the setup for the analysis of contemporary and ancient coins, we carried out a feasibility study by irradiating a selected number of Saudi Arabian coins dating from 1958 to 1987 in the thermal-neutron flux. The induced gamma-ray activities were then counted using a HP-GMX detector coupled to a PC-based data acquisition and analysis system. The elements that were determined in the coins were copper (around 75 %), nickel (around 25%), and manganese (< 0.5 %). Calibration curves were also established for these elements. The determined concentrations are in agreement with the data published by the Standard Catalogue of World Coins.
机译：KFUPM的基于加速器的热中子活化分析装置具有足够的热中子通量，可以有利地用于各种样品的元素分析，包括考古样品。热中子是由D（d，n）〜3He反应产生的快中子产生的，后者产生2.5 MeV快中子。获得的最大热通量约为2.5 x 10〜6 n / cm〜2-s。为了确定适合于分析现代和古代硬币的装置，我们通过对热中子通量辐照1958年至1987年选定数量的沙特阿拉伯硬币进行了可行性研究。然后使用耦合到基于PC的数据采集和分析系统的HP-GMX检测器对诱发的伽马射线活动进行计数。硬币中确定的元素是铜（约75％），镍（约25％）和锰（<0.5％）。还为这些元素建立了校准曲线。确定的浓度与《世界硬币标准目录》发布的数据一致。

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