Determination of 235U/238U Isotope Ratios in Camphor Tree Bark Samples by MC-ICP-MS after Separation of Uranium from Matrix Elements
WANG Xiao-ping1,ZHANG Ji-long2
1. School of Radioactive Medicine and Public Hygiene,Suzhou University,Suzhou 215123,China 2. Radiochemistry Department,China Institute of Atomic Energy,Beijing 102413,China
Abstract：Twelve camphor (cinnamomum camphora) tree bark samples were collected from Hiroshima and Kyoto,and the matrix element composition and morphology of the outer surface of these camphor tree bark samples were studied by EDXS and SEM respectively. After a dry decomposition,DOWEX® 1-X8 anion exchange resin was used to separate uranium from matrix elements in these camphor tree bark samples. Finally,235U/238U isotope ratios in purified uranium solutions were determined by MC-ICP-MS. It was demonstrated that the outer surface of these camphor tree bark samples is porous and rough,with Al，Ca，Fe，K，Mg，Si,C，O and S as its matrix element composition. Uranium in these camphor tree bark samples can be efficiently separated and quantitatively recovered from the matrix element composition. Compared with those collected from Kyoto,the camphor tree bark samples collected from Hiroshima have significantly higher uranium contents,which may be due to the increased aerosol mass concentration during the city reconstruction. Moreover,the 235U/238U isotope ratios in a few camphor tree bark samples collected from Hiroshima are slightly higher than 0.007 25.
王小平1,张继龙2 . 基体分离/MC-ICP-MS测定树皮表层235U/238U同位素比率[J]. 光谱学与光谱分析, 2007, 27(07): 1428-1432.
WANG Xiao-ping1,ZHANG Ji-long2. Determination of 235U/238U Isotope Ratios in Camphor Tree Bark Samples by MC-ICP-MS after Separation of Uranium from Matrix Elements . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(07): 1428-1432.
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