I-129 and I-131 ground deposition densities are correlated in Belorussian settlements contaminated following the Chernobyl accident
Title: I-129 and I-131 ground deposition densities are correlated in Belorussian settlements contaminated following the Chernobyl accident
Author: Masaharu Hoshi, Valery F Stepanenko, Yuri I Gavrilin, Yuri M Volkov, Irina K Makarenkova, Jun Takada, Valery E Shevchuk, Valery G Skvortsov, Dmitry V Petin, Elena K Iaskova, Alexey E Kondrashov, Alexander I Ivannikov, Nataly M Ermakova, Leonid N Chunikhin
Reference: International Congress Series, Volume 1234, May 2002, Pages 115-120
DOI: http://dx.doi.org/10.1016/S0531-5131(01)00601-X
Keywords: Chernobyl accident; I-129; I-131; Thyroid dose
Abstract: Long-living I-129 is considered as the witness of short-living I-131 fallout following the Chernobyl accident. Data on I-129 deposition densities might help to estimate thyroid doses in population of many contaminated areas where information on the I-131 ground deposition density is unknown.
This pilot study aimed to investigate the correlations between I-129 ground deposition densities measured in 2000 and those of I-131 measured in 1986.
I-129 measurements were performed by iodine separation and registration of I-129 decays using beta-x coincidence. Soil samples were collected and I-129, Cs-137 ground deposition densities were measured in three contaminated raions of Belorussia (14 locations in 12 settlements). For 10 of 12 settlements, there were available data of I-131 and Cs-137 spectrometric measurements during the first weeks after the accident in 1986.
Results of I-129 and Cs-137 measurements in 2000 were used for the reconstruction of I-131/Cs-137 ratio. Comparisons of reconstructed I-131/Cs-137 ratios with the I-131/Cs-137 ratios obtained by direct measurements in 1986 showed good agreement: correlation coefficient was 0.69 and linear regression coefficient (±SD) was 2.36(±0.88). The study confirms the possibility to apply the data on I-129 ground deposition densities for further application to improve estimations of thyroid absorbed doses, which result from I-131 irradiation.
URL: http://www.sciencedirect.com/science/article/pii/S053151310100601X
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