Determination of thorium isotopes in seawater by nondestructive and radiochemical procedures

Deep-sea research. Part A, Oceanographic research papers Pub Date : 1992-07-01 DOI:10.1016/0198-0149(92)90059-3

Ken O Buesseler , J.Kirk Cochran , Michael P Bacon , Hugh D Livingston , Susan A Casso , David Hirschberg , Mary C Hartman , Alan P Fleer

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引用次数: 126

Abstract

Procedures have been developed for the analyses of dissolved and particulate ²³⁴Th, ²²⁸Th, ²³⁰Th and ²³²Th in seawater. Large volume samples (>1000 1) are collected using in situ pumps. Seawater is pumped sequentially through a filter cartridge and two MnO₂ adsorbers for the collection of particulate and dissolved Th, respectively. Both filters adsorbers are analysed for ²³⁴Th using a simple gamma counting technique. This newly developed ²³⁴Th procedure can be conducted at sea, and thus provides an easy and efficient method for ²³⁴Th analyses on large volume samples. Subsequent radiochemical purification procedures and low-level alpha counting techniques are used in the laboratory for the analyses of ²²⁸Th, ²³⁰Th and ²³²Th on these same samples.

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用无损和放射化学方法测定海水中钍同位素

已经制定了分析海水中溶解和颗粒234、228、230和232的程序。使用原位泵收集大量样品(>1000 1)。海水依次通过过滤筒和两个MnO2吸附剂泵入，分别收集颗粒和溶解的Th。使用简单的伽马计数技术分析了两种过滤器吸附剂的234。新开发的234程序可以在海上进行，因此为大批量样品的234分析提供了一种简单有效的方法。随后的放射化学纯化程序和低水平α计数技术在实验室中用于分析这些样品上的228Th, 230Th和232Th。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Deep-sea research. Part A, Oceanographic research papers

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