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In this study a series of synthetic mixtures of thorium isotopes was prepared on gravimetrical basis. The starting compounds consisted of natural thorium Th-232 (99.99%) and highly enriched Th-230 (99.8%). These materials were chemically purified and characterized for isotopic composition and chemical purity. ThO(2) was demonstrated to be a suitable compound for gravimetrical blending. The isotope amount ratios in the mixtures range from 1E-2 to 3E-6. These synthetic isotope mixtures are the first ever prepared for thorium. They may serve for the calibration of measurements of thorium isotope amount ratios.

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Authors: RAPTIS K, JRC Geel (BE);HENDRICKX F, JRC Geel (BE);DE BIÈVRE P, JRC Geel (BE);MAYER K, JRC Karlsruhe (DE)
Bibliographic Reference: Article: International Journal of Mass Spectrometry and Ion Processes (1997)
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