An examination of geochronological utility of electron capture decay of La-138
An examination of geochronological utility of electron capture decay of La-138
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La-138 电子俘获衰变地质年代学效用的检验
DOI：
10.2343/geochemj.17.313
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
S. Nakai
中科院分区：
文献类型：
--
作者：
A. Masuda;S. Nakai
138 La衰变模式是一个分支衰变模式，并对其影响进行了修正. Ba的来源涉及衰变和电子俘获。污染，这应该在这里纠正，是田中和增田（1982）成功地从化学品的洗脱液中得出的，证明了“'La "的适用性，通过阳离子交换衰变分离Ba的岩石定年，这表明在柱。同时讨论了稀土138 Ce的衰变产物A作为地球化学同位素指示剂的意义。这里的矿物是，最初的138 Ba/136 Ba的比例可以被认为是基本上不变的，只要我们的138 La电子捕获的报告，我们的检查可能的用途的结果。就目前的知识而言，考虑到通常范围内的镧/钡的纯度也有相同的比例。雅阁Ba丰度比是很低的同位素，只要实验程序设计成138 La的百分含量（0.089%）和它的很长时间具有相同的Ba污染半衰期（-I × 10 ~（11）y），可以说Ba同位素组成13' La的电子俘获效应对地质测量和Ba丰度测定都没有用。
The 138 La decay mode is a branching one effects were corrected. The source of Ba con involving a decay and electron capture. tamination, which should be corrected here, is TANAKA and MASUDA (1982) succeeded in derived from the eluting solution for chemical demonstrating the applicability of "'La a separation of Ba through the cation exchange decay to the dating of rocks, suggesting at the column. same time the significance of the decay product A merit of La-Ba dating for rare-earth 138 Ce as a geochemical isotope indicator . Here minerals is that the initial 138 Ba/136 Ba ratio can the results of our examination of possible utility be taken as substantially invariable, so far as our of the 138 La electron capture are reported. present knowledge is concerned, and the im Taking into account the usual range of La/ purity barium also has the same ratio. Accord Ba abundance ratio, the very low isotopic per ingly, provided that the experimental procedures centage (0.089%) of 138 La, and its very long are designed to have the same Ba contamination half-life (-I x 1011 y), one can say that the effects both for the Ba isotopic composition 13' La electron caputure is of no use as a geo measurement and for the Ba abundance deter