Relation of Cs-137 Fallout with Annual Precipitation in Northwestern Iran

Document Type : Research Paper

Authors

1 Assistant Professor, Agriculture and Natural Resources College, University of Kurdestan

2 Researcher in Agriculture and Natural Resources Research Center of Kordestan, respectively.

Abstract

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.

Keywords

References

  1. شاهویی، ص.1375.چهره های مختلف تخریب اراضی در حوزه آبخیز گرگان رود و اثر آن بر خصوصیات خاک و کاهش توان تولید. پایان نامه دکترای خاک شناسی دانشگاه تهران.
  2. خالدیان ، ح.1374.کاربرد سزیوم –137 در مطالعات فرسایش خاک،کنفرانس منطقه ای مدیریت منابع آب. دانشگاه صنعتی اصفهان.
  3. یوسف کلافی ،س.1373. استفاده از سزیوم –137 در اندازه گیری فرسایش سطحی. پایان نامه کارشناسی ارشد دانشگاه تربیت مدرس.
  4. مصباح،ح. 1374.بررسی فرسایش و رسوب حوزه بردکن استان فارس با استفاده از کاربرد سزیوم–137 و مدل EPM . پایان نامه کارشناسی ارشد دانشگاه تهران.
  5. Fuhrmann, M., Lasat, M., Stephen, E., Jay, C. and Leon, K. 2003. Uptake and release of Cs-137 by five plant species as influenced by soil amendment in field experiments, Journal of Environmental Quality, 32(6): 2272-2279.
  6. Walling, D.E and Quine,T.A.1993.Use of Cs-137 as a tracer of erosion and sedimentation: Handbook for Application of the Cs-137 Technique, Department of Geography, University of Exeter.
Iranian Journal of Soil Research
Volume 19, Issue 1
May 2005
Pages 77-85

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