Comparison of Multiple Prompt γ-Ray Analysis and Prompt γ-Ray Analysis for the Elemental Analysis of Geological and Cosmochemical Samples
Comparison of Multiple Prompt γ-Ray Analysis and Prompt γ-Ray Analysis for the Elemental Analysis of Geological and Cosmochemical Samples
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DOI：
10.1021/ac201706g
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发表时间：
2011-10-01
影响因子：
7.4
通讯作者：
Harada, Hideo
中科院分区：
文献类型：
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作者：
Islam, Mohammad Amirul;Ebihara, Mitsuru;Harada, Hideo
多次瞬发伽马分析(MPGA)和常规中子诱发瞬发伽马分析(PGA)是一种非破坏性的块状化学成分分析方法，比较了它们在地质和宇宙化学样品元素分析中的分析能力。PGA的检测灵敏度往往受到低信噪比和来自不同来源的干扰的限制。与PGA相比，MPGA可以大大降低背景水平，特别是对含氢样品，这为使用某些痕量元素的低能瞬发伽马射线开辟了可能性。虽然镁是岩石样品的主要组成元素之一，但镁很难用PGA测定。在不进行干扰校正的情况下，通过仔细选择合适的符合瞬发伽马射线能量对，MPGA可以测定镁含量，并与地质和宇宙化学样品中相应的推荐值保持合理的一致性。将MPGA应用于含氢陨石依夫纳，其质量分数为2%。在本实验条件下，大多数元素的MPGA检出限可比PGA检出限降低1个数量级。
Multiple prompt gamma-ray analysis (MPGA) and conventional neutron-induced prompt gamma-ray analysis (PGA) are nondestructive analytical methods for bulk chemical compositions, and their analytical capabilities were compared for elemental analyses of geological and cosmochemical samples. Detection sensitivities of PGA are often restricted by poor signal-to-noise ratios and interferences from different origins. MPGA can substantially reduce the background level, especially for hydrogenous samples, relative to PGA, which opens up a possibility to use lower energy prompt gamma-rays of some trace elements. Although it is one of the major constituent elements of rock samples, Mg is hard to be determined by PGA. With MPGA, Mg contents could be determined with reasonable consistency with their corresponding recommended values in geological and cosmochemical samples by carefully selecting suitable coincident prompt gamma-ray energy pairs without interference correction. MPGA was applied to a hydrogenous meteorite, Ivuna, which contains H at 2% mass level. MPGA detection limits for most of the elements studied can be reduced up to 1 order of magnitude when compared with PGA detection limits under the present experimental conditions.