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KMID : 0385520070200060460
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Analytical Science & Technology
2007 Volume.20 No. 6 p.460 ~ p.467
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Dose rate conversion factor for soil by the beta-rays and gamma-rays from 238,235U, ²³²Th and ⁴?K
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Kim Gi-Dong
Eum Chul-Hun
Bang Jun-Hwan
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Abstract
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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 238,235U, ²³²Th, and ⁴?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 ²³?U, ²³²Th and ⁴?K are estimated to have good agreements but a large difference is shown in this for ²³?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.
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KEYWORD
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Dose rate conversion factor, beta-ray, gamma-ray, annual effective dose of soil
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