Determination of uranium concentrations and activity ratios in silicates by alpha spectrometry: application to the volcanic rocks from the Trindade and Martin Vaz Islands (Brazil)

被引：14

作者：

dos Santos, RN

Marques, LS

Ribeiro, FB

机构：

[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfericas, BR-05508900 Sao Paulo, Brazil

[2] PUCSP, CCET, BR-01303050 Sao Paulo, Brazil

来源：

APPLIED RADIATION AND ISOTOPES | 2002年 / 56卷 / 05期

基金：

巴西圣保罗研究基金会;

关键词：

ion exchange chromatography; electrodeposition uranium; U-234(/238) U activity ratio; Brazilian geological standards; Trindade island;

D O I：

10.1016/S0969-8043(01)00263-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A detailed radiochemical procedure for alpha spectrometry measurements of uranium concentrations and of U-234/U-238 activity ratios in silicates is presented. The described chemical processing is characterized by relatively high uranium yields, in the range of 51-89%. The application of this chemical procedure to geological standards allowed estimating a reproducibility of the alpha spectrometry uranium measurements on the order of 3.5%. As an application example, the procedure was used in the analysis of quaternary volcanic rocks from the Trindade and Martin Vaz Islands. Brazil. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：741 / 750

页数：10

共 42 条

[1]

Almeida F.F.M., 1961, Geologia e petrologia da Ilha de Trindade, P197

[2] DETERMINATION OF NATURAL ACTINIDES AND PLUTONIUM IN MARINE PARTICULATE MATERIAL [J].