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A study of characteristics of cumulative deposition of fallout Pu in environmental samples

박영재|김원용|송병철|지광용|이명호
한국분석과학회|2006.02|분석과학 (Analytical Science & Technology)|제19권 제1호|pp. 18-30

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참고문헌

주제분류화학

초록

Abstract

This paper describes the cumulative deposition of falout Pu in soil and lichen at the present timeof 239,240Pu were estimated to be in the range of 34.0 to 101.2 Bq m2 with an average value of 65.3± 21.6Bq m2. The average inventory of 239,240Pu in the forest was calculated to be two times higher than that inthe hill. Also, the deposited activities of 239,240Pu in cultivated soil were significantly lower than those in thehill or forest. However, the cumulative depositions of fallout Pu in the volcanic ash soil on Cheju Island weremuch higher than those in the forest and hill soils. The measured activity concentrations of Pu isotopes inlichens and mosses showed large variations, due to characteristics of species and life span of lichen and mosscolonies. From depth profiles, it was found that most of the fallout Pu has been accumulated in upper 10 cm239,240Pu in soil tended to decrease exponentiallywith increasing soil depth. Among parameters afecting the cumulative deposition of falout Pu, organicsubstances and rainfall play an important role in the retention and relative mobility of fallout Pu in the soil.However, pH showed a weak correlation with the deposition of fallout Pu in the soil. From sequential leachingBoth the activity ratios of 238Pu/239,240Pu and 241Pu/239,240Pu in soils, lichens and mosses and the atomic ratiosof 240Pu/239Pu in soils are close to those observed in the cumulative deposit global fallout from nuclear weaponPu under natural conditions.

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