• Title/Summary/Keyword: Sr-90 농도

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Uptake and Accumulation of Soil Strontium-90 by Peanut and Sesame (토양 strontium-90의 땅콩과 참깨에 의한 흡수 및 축적)

  • Choi, Yong-Ho;Jo, Jae-Seong
    • Korean Journal of Environmental Agriculture
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    • v.15 no.1
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    • pp.11-18
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    • 1996
  • A greenhouse experiment on the Sr-90 uptake by peanut and sesame was conducted through pot cultures on a sandy loam soil of pH 6.35 treated with Sr-90 in 5.2 and 31.2Bq per gram. The rate of Sr-90 transfer from soil to each plant part, the ratio of Sr-90 concentration in the part to the concentration in soil, and the patterns of their temporal changes were not, on the whole, significantly different between the two treatments. About 0.7 and 0.5 % of Sr-90 in soil transferred to all the mature plants of peanut and sesame, respectively, with the radioactivities in their roots not counted. Only 4% and less than 15% of Sr-90 absorbed by peanut and sesame, respectively, translocated to their seeds. Both crops showed the highest Sr-90 concentration in the leaf and the lowest in the seed. At maturities, the concentration ratio in dry seed was 0.4 in peanut and 3.3 in sesame and that in dry leaf was 12.5 and 10.7, respectively. Sr-90 concentrations in the top 15 cm soil after harvests averaged about 80 % of the concentrations at starting. Sr-90 uptake resulted in neither growth inhibition nor yield decrease.

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A Numerical Model for Nuclide Migration in the Far-field of the Repository (처분장 Far-field에서의 핵종이동 수치 모델)

  • Lee, Youn-Myoung;Lee, Han-Soo;Park, Heui-Joo;Cho, Won-Jin;Han, Kyong-Won;Park, Hun-Hwee
    • Nuclear Engineering and Technology
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    • v.21 no.4
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    • pp.267-276
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    • 1989
  • A numerical model for nuclide migration through fractured rock media has been developed. Nuclide transport with groundwater in rock fissures and the diffusion of nuclides into rock matrix are considered one-dimensionally . In the safety assessment of the repository for radioactive waste, this one-dimensional model by the finite-difference scheme, which enables us not only to use more realistic boundary conditions but also to model the nonhomogeneous rock medium as the multilayered media, can be used effectively with the analytical mode. The solution by the numerical model will be verified analytically, and then extended to the double-layered rock medium transport model.

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Absorption and Accumulation of Sr-90 by Rice and Soybean and Its Soil-to-Plant Transfer Coefficients (벼와 콩에 의한 Sr-90 흡수.축적 및 토양-작물체간 전이계수)

  • Park, Yong-Ho;Lee, Chang-Woo;Lee, Kang-Suk;Lee, Jeong-Ho;Jo, Jae-Seong;Chung, Kyu-Hoi
    • Nuclear Engineering and Technology
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    • v.24 no.2
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    • pp.121-129
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    • 1992
  • Radio-tracer experiments on the Sr-90 absorption by rice and soybean from a sandy-loam soil of pH 6.35 treated with 5.2 and 31.2Bq Sr-90 per g-soil were carried out through pot cultivations. Sr-90 absorption rates of both crops increased till the mature stage when the rates were about 1.0%. Concentrations in their whole tops, however, decreased or changed little as they grew. Sr-90 concentrations in plant parts of both crops increased with the increase of those in soil. Soil-to-plant transfer coefficients of Sr-90 for rice and soybean at mature stages ranged, on the dry weight basis, from 0.07(unpolished seed) to 3.67(lean and from 0.86(seed) to 9.26(leaf), respectively. Only the unpolished rice seed showed a significant difference in the coefficient with 0.17 in 5.2Bq treatment and 0.07 in 31.2Bq treatment. Sr-90 retention rates of the upper 15cm soil after crop harvests were about 80% Sr-90 absorptions had no effect on the plant growth and yield of the crops.

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Sr-90 Uptake by the Barley (Hordeum vulgare L. emend. Lamark) and Soil-to-Plant Transfer Coefficient (보리의 토양 Sr-90 흡수 및 토양 - 작물체 전이계수)

  • Choi, Yong-Ho;Chung, Kyu-Hoi;Chun, Ki-Jung;Kim, Sam-Rang;Lee, Jeong-Ho
    • Journal of Radiation Protection and Research
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    • v.16 no.1
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    • pp.33-42
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    • 1991
  • A pot experiment on the Sr-90 uptake by the barley from a loamy-sandy soil of pH 6.05 treated with Sr-90 and slaked lime was carried out in a green house. The rate of Sr-90 uptake at maturity was, on an average, 0.41% for a naked barley Neolssalbori and 0.23% for a covered one Olbori. Transfer coefficients of Sr-90 for the former were higher than those for the latter by about 30-60% depending on the plant parts. There were, on the whole, not significant differences in the rate and in the coefficient among Sr-90 concentration treatments. Slaked lime addition equivalent to about 94kg/10a was not effective for lessening Sr-90 uptake or diminishing Sr-90 transfer coefficient. As transfer coefficients, 1.51, 4.45, 0.35, and 1.30, on the dry weight basis, could be proposed for the stem, leaf, seed, and whole top of the barley, respectively. Growth inhibition or yield decrease due to Sr-90 uptake was not observed.

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