Application of Tagged Neutron Method for Element Analysis of Phosphorus Ore

I. Bolshakov, Maxim B. Kolesnik, M. Sorokin, V. Kremenets, E. Razinkov, Y. Rogov, M. Sapozhnikov
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引用次数: 1

Abstract

The results of testing of AGP-F analyser based on the tagged neutron method on the phosphorus ores of the Kovdor deposit are presented. The tagged neutron method (TNM) consists in irradiating the ore with fast neutrons with energy of 14 MeV and recording the characteristic radiation of gamma quanta from reactions of inelastic neutron scattering in certain time intervals between the emission of a neutron and the arrival of a signal from a gamma quantum. Unique possibility of TNM is information about time between signals from α- and γ-detectors. It allows selecting γ-rays coming only form the object under study. Using TNM allows increasing signal/background ratio by factor 200. Another advantage of TNM in comparison with other methods of ore express analysis is high penetration ability of 14 MeV neutrons. The experimental setup consists of neutron generator with 9 α-channels and 12 γ-detectors. It allows determining the elemental composition of ore in the field conditions without any sample preparation. The tests show that for moisture of the sample up to 20% the difference between results of dry and wet sample analysis does not exceed the reproducibility limit. The reason is the possibility to determine concentration of oxygen that is provided by TNM. It is possible to measure the large samples of 1-2 kg with accuracy, reasonable for the field measurements, in 10-15 minutes.
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标记中子法在磷矿石元素分析中的应用
介绍了基于标记中子法的AGP-F分析仪对科夫多矿床磷矿石的测试结果。标记中子法(TNM)是用能量为14mev的快中子照射矿石,并在中子发射和伽马量子信号到达之间的一定时间间隔内记录非弹性中子散射反应产生的伽马量子特征辐射。TNM的独特可能性是来自α和γ探测器的信号之间的时间信息。它允许选择只来自研究对象的γ射线。使用TNM可以将信号/背景比增加200倍。与其他矿石速成分析方法相比,TNM的另一个优点是14mev中子的高穿透能力。实验装置由9个α通道中子发生器和12个γ探测器组成。它允许在现场条件下确定矿石的元素组成,而无需任何样品制备。试验表明,当样品含水率高达20%时,干法和湿法样品分析结果之间的差异不超过再现性限制。原因是可以确定TNM提供的氧气浓度。可以在10-15分钟内准确测量1-2公斤的大样品,适用于现场测量。
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3.50
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0.00%
发文量
6
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