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http://dx.doi.org/10.5806/AST.2007.20.6.460

Dose rate conversion factor for soil by the beta-rays and gamma-rays from 238,235U, 232Th and 40K  

Kim, Gi-Dong (Geochemical Analysis Center, Korea Institutes of Geoscience, and Mineral Resources)
Eum, Chul-Hun (Geochemical Analysis Center, Korea Institutes of Geoscience, and Mineral Resources)
Bang, Jun-Hwan (Geochemical Analysis Center, Korea Institutes of Geoscience, and Mineral Resources)
Publication Information
Analytical Science and Technology / v.20, no.6, 2007 , pp. 460-467 More about this Journal
Abstract
Dose rate conversion factor was calculated to estimate the absorbed effective annual doses for soils for the beta-rays and gamma-rays, which were emitted from $^{238,235}U$, $^{232}Th$, and $^{40}K$ isotopes. The most recent data of the emitted energies per decay, half-lifes, and branching ratios, which were obtained from National Nuclear Data Center, were used. When this factor and the effective annual doses for the beta-rays and the gamma-rays of natural radioisotopes were compared with those of Aitken, these of $^{238}U$, $^{232}Th$ and $^{40}K$ are estimated to have good agreements but a large difference is shown in this for $^{235}U$. Through the calculations of effective annual doses by using these factor and the measurements of gamma-ray spectra for soils, which were extracted from prehistoric remains (Mansuri) on Osong, Chungchengbuk-do, The annual effective doses were obtained to be 3.8~5.9 mGy/yr. Also, when these doses including decay elements upper Rn were compared with those on all isotopes, the differences within 9~30 % were obtained. The analysis method of the annual effective doses for the beta-rays and the gamma-rays of the natural isotopes of soils was established by this dose rate conversion factor.
Keywords
Dose rate conversion factor; beta-ray; gamma-ray; annual effective dose of soil;
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