Accurate and efficient determination of boron content in volcanic rocks by neutron induced prompt gamma-ray analysis
Accurate and efficient determination of boron content in volcanic rocks by neutron induced prompt gamma-ray analysis
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中子诱导瞬发伽马射线分析准确高效测定火山岩中的硼含量
DOI：
10.1007/bf02349080
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发表时间：
1999
影响因子：
1.6
通讯作者：
H. Sawahata
中科院分区：
文献类型：
--
作者：
T. Sano;T. Fukuoka;T. Hasenaka;C. Yonezawa;H. Matsue;H. Sawahata
建立了中子诱导提示γ射线测定火山岩中硼含量的准确、高效的分析方法。我们用硅作为内标，修正了样品几何形状和通量波动的影响。然而，我们发现不同基质的火山样品的校准线斜率是不同的。由于硼活度的增加与氢（水）的γ射线计数率呈正相关，我们称之为氢效应。我们的实验证实了氢效应，随着氢（水）的加入，硼的活度呈现出系统的增加。然而，大多数火山岩含有很少的水（<2 wt.%）来显示这种效应。我们测定了各种火山岩中的硼含量，以证实我们建立的方法的有效性。分析的硼含量与先前报道的值吻合得很好。对于火山岩中硼元素的高效PGA，我们推荐将JB-2 （GSJ标准岩）作为单一地球化学标准岩，因为它的硼含量很高（31.2 ppm）。
An accurate and efficient analytical method using neutron-induced prompt γ-ray was developed for the determination of boron contents in volcanic rocks. We corrected the effect of sample geometry and flux fluctuation by using silicon as an internal standard. However, we found that the slopes of the calibration line vary among volcanic samples with different matrix. Because the increase of boron activity correlates positively with γ-ray count rate of hydrogen (water), we call this as the hydrogen effect. The hydrogen effect was confirmed by our experiment in which the boron activities showed systematic increase with the amount of added hydrogen (water). Most volcanic rocks, however, contain little water (<2 wt.%) to show this effect. We determined boron contents in various volcanic rocks in order to confirm the validity of the procedure that we established. The analyzed boron contents agreed well with the previous reported values. For efficient PGA of boron in volcanic rocks, we recommend JB-2 (GSJ standard rock) as a single geochemical standard, because of its high boron content (31.2 ppm).