Precise determination of 235U/238U isotope ratio in soil samples by using thermal ionisation mass spectrometry

S. Sahoo; H. Isobe; T. Sato; K. Fujimoto; Y. Nakamura

doi:10.1023/a:1015745717871

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 252: Issue 2

Precise determination of ²³⁵U/²³⁸U isotope ratio in soil samples by using thermal ionisation mass spectrometry

Authors:

S. Sahoo

S. Sahoo National Institute of Radiological Sciences 4-9-1 Anagawa Inage-ku, Chiba 263-8555 Japan

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H. Isobe

H. Isobe National Institute of Radiological Sciences 4-9-1 Anagawa Inage-ku, Chiba 263-8555 Japan

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T. Sato

T. Sato National Institute of Radiological Sciences 4-9-1 Anagawa Inage-ku, Chiba 263-8555 Japan

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K. Fujimoto

K. Fujimoto National Institute of Radiological Sciences 4-9-1 Anagawa Inage-ku, Chiba 263-8555 Japan

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Y. Nakamura

Y. Nakamura National Institute of Radiological Sciences 4-9-1 Anagawa Inage-ku, Chiba 263-8555 Japan

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Pages:: 241–245

Online Publication Date:: 01 Nov 2004

Publication Date:: 17 May 2002

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1015745717871

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Abstract

A rapid method based on extraction chromatography was developed for the separation of uranium from soil samples for TIMS. The isotope ratios were measured on three standards using a VG 54-30 thermal ionisation mass spectrometer in static mode with Faraday cup and Daly ion counting system. The use of a WARP (Wide Aperture Retardation Potential) energy filter improves abundance sensitivity by an order of magnitude over a conventional VG Sector TIMS. An abundance sensitivity of 28 ppb at mass 237 with respect to ²³⁸U can be achieved. By correcting mass bias as a function of ion beam intensity, precision of the ²³⁵U/²³⁸U ratio was enhanced with a sample load of around 300 ng U. The resulting reproducibility for standards and soil samples was better than 0.2% at two standard deviations. Uranium isotopic compositions have been determined in soil samples and compared between Chernobyl nuclear accident site and the criticality accident, which occurred in Japan at the JCO site.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)