Title: Preparation and Certification of New Thorium Isotopic Reference Materials.
Authors: RAPTIS KonstantinosMAYER KlausHENDRICKX Frans karelDE BIEVRE Paul jan cyriel
Citation: Fresenius Journal of Analytical Chemistry vol. 361 no. 5 p. 400-403
Publication Year: 1998
JRC N°: JRC17597
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC17597
Type: Articles in periodicals and books
Abstract: Preparation of two Isotopic Reference Materials of thorium has been performed, starting from highly enriched 232Th (99.99%) and 230Th (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(230Th)/n(232Th) 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.
JRC Directorate:Nuclear Safety and Security

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