DETERMINATION OF FEMTOGRAM QUANTITIES OF PROTOACTINIUM IN GEOLOGIC SAMPLES BY THERMAL IONIZATION MASS-SPECTROMETRY

被引：59

作者：

PICKETT, DA

MURRELL, MT

WILLIAMS, RW

机构：

[1] Sciences Isotope, J514, Los Alamos National Laboratory, Los Alamos

来源：

ANALYTICAL CHEMISTRY | 1994年 / 66卷 / 07期

关键词：

D O I：

10.1021/ac00079a020

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We describe a procedure for measurement of Pa-231 in geologic samples by isotope dilution thermal ionization mass spectrometry, using Pa-233 as a spike isotope, which provides marked improvements in precision and sample size relative to established decay counting techniques. This method allows determination of as little as a few tens of femtograms of Pa-231 (approximately 10(8) atoms) with a conservative estimated uncertainty of +/-1% (95% confidence level). Applications of Pa-231-U-235 systematics to uranium-series geochemistry and geochronology should be greatly enhanced by this approach.

引用

页码：1044 / 1049

页数：6

共 32 条

[21] THORIUM ISOTOPE RATIO MEASUREMENTS AT HIGH ABUNDANCE SENSITIVITY USING A VG-54-30(R), AN ENERGY-FILTERED THERMAL IONIZATION MASS-SPECTROMETER [J].