نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار دانشکده کشاورزی و منابع طبیعی دانشگاه کردستان
2 عضو هیأت علمی مرکز تحقیقات کشاورزی و منابع طبیعی کردستان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Cs-137 is a man made nuclide released from nuclear weapon explosions in the 1960 and 1970 decades and introduced into troposphere, from where it is precipitated by rain. Cs-137 has a small hydrated radius, which is strongly attracted by negative charges on colloid surfaces. It is neither leached through soil nor absorbed by plant roots, so its loss in the soil is related to its translocation by tillage or runoff. Determining the Cs-137 inventory is a prerequisite for soil erosion research. Finding a typical undisturbed site for sampling is tedious and difficult. Establishment of a relation between annual precipitation and Cs-137 concentration will facilitate determining Cs-inventory. In this study, undisturbed incremental core samples of soil for different depths were collected in 12 climatological stations in northwest part of the country. Cs-activity was determined by vandograph section of Iranian Atomic Energy Organization (AEO) with a pure Germanium detector with 85% efficiency. The regression analysis between annual precipitation and Cs-137 fallout was significant at the 0.001 level with r2=0.88. In this study the maximum fallout in Becquerel/m2 was 2895 in Marivan station with 974.7 (mm) annual precipitation while a/ minimum value of 621 was recorded in Dehgolan station with 270 (mm) annual precipitation.
کلیدواژهها [English]
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