Determination of isotopic thorium in biological samples by combined alpha-spectrometry and neutron activation analysis

被引：13

作者：

Glover, SE ^{[1
]}

Filby, RH ^{[1
]}

Clark, SB ^{[1
]}

机构：

[1] Washington State Univ, Dept Chem, Pullman, WA 99164 USA

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 1998年 / 234卷 / 1-2期

关键词：

D O I：

10.1007/BF02389772

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The determination of isotopic thorium by alpha-spectrometric methods is a routine practice for bioassay and environmental measurement programs. Alpha spectrometry has excellent detection limits (by mass) for all isotopes of thorium except Th-232 due to its extremely long half-life. This paper reports a pre-concentration neutron activation analysis (PCNAA) method for Th-232 that may be performed following alpha-spectrometry if a suitable source preparation material is utilized. Human tissues and other samples were spiked with Th-229 and the thorium was isolated from the sample using ion exchange chromatography. The thorium was then electrodeposited from a sulfate-based medium onto a vanadium planchet, counted by alpha-spectrometry, and then analyzed for Th-232 by neutron activation analysis. The radiochemical yield was determined from the alpha-spectrometric method. Detection limits for Th-232 by this PCNAA method are approximately 50 times lower than achieved by alpha-spectrometry.

引用

页码：201 / 208

页数：8

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