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KMID : 0364920100350030117
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Journal of Radiation Protection and Research
2010 Volume.35 No. 3 p.117 ~ p.123
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The Improved Method for Precise Determination of Pu Isotope Ratio using MC-ICP-MS
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Yim Seong-A
Han Eun-Mi
Chae Jung-Seok
Yun Ju-Yong
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Abstract
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Plutonium is by far the most important of the transuranic elements which have been released into the environment due to radio-toxicity and long term radiation effects on humans. And Pu isotope ratio (240Pu/239Pu) is of great interest because this ratio is used as a fingerprint for different sources. Mass spectrometry has been used as an useful atom counting technique with several advantages over decay counting techniques for the determination of Pu isotopes. It enables a determination of Pu isotope ratio in the environmental samples with a low detection limit and a short determination time. An ICP-MS is the representative mass spectrometry for Pu determination. In this study, the precision of 240Pu/239Pu isotope ratio was improved by using 4 multiple ion counters of MC-ICP-MS. The detection limit of 239Pu and 240Pu were 0.10 fg ml-1 (0.24 μBq ml-1), 0.12 fg ml-1 (0.97 μBq ml-1), respectively. The relative standard deviation of 240Pu/239Pu isotope ratio was less than 1 % in trace level. The various reference materials (seawater, soil and sediment) were analyzed to verify this method and their analytical results were in good agreement with the certified (or recommended value) value.
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KEYWORD
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Mass bias correction, Pu isotope ratio, MC-ICP-MS, Mass bias correction, Precision
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