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|標題:||The contents and forms of solid-phase species of radioactive strontium and cesium in Taiwan soils||作者:||Chien, S.W.C.
|關鍵字:||Cs-137;Sr-85;solid-phase species;gamma (gamma) ray spectra;radioactivity;extraction;al;fe||Project:||Environmental Monitoring and Assessment||期刊/報告no：:||Environmental Monitoring and Assessment, Volume 125, Issue 1-3, Page(s) 29-39.||摘要:||
This study was to investigate the activities and contents of Cs-137 in the profiles of selected arable and forest soils in Taiwan and various solid-phase species of Sr-85 and Cs-137 in selected arable soils in Taiwan. The gamma (gamma) ray spectra of the collected soil samples and some of the soils amended with Sr-85 and Cs-137 were measured. The data indicate that the arable soils from Sanhsing series, Sanhsing Township and Chuangwei series, Chuangwei Township, Ilan County, and from Tunglochuan series, Pinglin Township, Taipei County shows significantly higher radioactivity of Cs-137 ( ND - 11.0 +/- 0.2 Bq kg(-1)). Furthermore, the radioactivity of Cs-137 in the mountain soils ( 1.24 +/- 0.07 - 42 +/- 1 Bq kg(-1)) from Yuanyang Lake Nature Preserve among Ilan, Taoyuan, and Hsinchu Counties is the highest among the investigated mountain forest soils. This may be mainly attributed to the fact that Ilan County is located in the northeastern part of Taiwan and faces the northeastern and northern seasonal winds with lots of precipitation annually from mid-autumn through mid-spring next year and is receiving greater amount of fallouts yearly. Due to longer reaction period (> 3 y) of Cs-137 with soil components, Cs-137 was mainly in the forms bound to oxides and to organic matter in the soil amended with Cs-137 and in the soil contaminated with Cs-137. On the contrary, due to shorter reaction period (< 60 d) of Sr-85 with soil components, Sr-85 was mainly in exchangeable form and partially in the forms bound to carbonates and oxides in the soils amended with Sr-85.
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