Preparation and certification of new thorium isotopic reference materials

被引：10
|
作者：
Raptis, K
Mayer, K
Hendrickx, F
De Bievre, P [1 ]
机构：
[1] Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, B-2440 Geel, Belgium
[2] Commiss European Communities, JRC, Inst Transuranium Elements, D-76125 Karlsruhe, Germany
来源：
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1998年 / 361卷 / 05期
关键词：
D O I：
10.1007/s002160050914
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Preparation of two Isotopic Reference Materials of thorium has been performed, starting from highly enriched Th-232 (99.99%) and Th-230 (99.8%). After full characterization (chemical and isotopic) of these purified base materials the thorium nitrate was transformed to thorium dioxide. Accurately weighed amounts of the two isotopes in the dioxide form were subsequently dissolved in nitric acid and resulted in solutions with amount ratios n(Th-230)/n(Th-232) close to 10(-5) (IRMM-035) and 3 . 10(-6) (IRMM-036). These gravimetrically prepared ratios were finally verified by means of Thermal Ionization Mass Spectrometry (TIMS). The purpose of the Reference Materials is to calibrate thorium isotope amount ratio measurements.
引用
收藏
页码：400 / 403
页数：4
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