NEUTRON-ACTIVATION ANALYSIS FOR ULTRA LOW CONTENTS OF URANIUM AND THORIUM IN ALUMINUM AND SILICA

被引：10

作者：

MITSUGASHIRA, T ^{[1
]}

KOMA, Y ^{[1
]}

HIRAI, S ^{[1
]}

OKADA, I ^{[1
]}

KURASHIMA, N ^{[1
]}

SAKURAI, H ^{[1
]}

机构：

[1] MUSASHI INST TECHNOL,ATOM ENERGY RES LAB,ASOU KU,KAWASAKI 215,JAPAN

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES | 1991年 / 147卷 / 01期

关键词：

D O I：

10.1007/BF02039567

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Highly sensitive neutron activation analysis of uranium and thorium in high quality silica and aluminium has been investigated using the Japan Materials Testing Reactor (JMTR), having a thermal neutron flux higher than 10(14) n/cm2/s. In order to determine ultra-low contents of uranium and thorium, Np-239 and Pa-233 as activation products were separated by using anion exchange and LaF3 coprecipitation methods. As a result, a number of interfering radioactive isotopes containing double neutron capture product such as Ta-183 were removed completely from the isolated Np-239 and Pa-233 fraction and the detection limits for uranium and thorium were found to be 2 . 10(-12) g and 4 . 10(-13) g, respectively.

引用

页码：69 / 77

页数：9

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