Journal article
Caesium-137 in Southeast Asia: Is there enough left for soil erosion and sediment redistribution studies?
Journal of Asian Earth Sciences, Vol.77, pp.108-116
2013
Abstract
Low reference inventories of the fallout radionuclide 137Cs in low latitudes may limit its present and future application for studies of soil erosion and sediment redistribution in Southeast Asia. 137Cs reference inventories and concentrations in surface materials measured in nine and five areas, respectively, across Southeast Asia are here reported and reviewed. The compiled reference inventories decrease from north to south. Three global estimates of 137Cs total fallout are also reviewed and compared to the measured data while taking into account factors that affect the fallout estimates and the reference inventory. The results are presented as a schematic regional distribution map of 137Cs reference inventories for the year 2012. A relationship between a reference inventory and topsoil concentration is also provided. The measured 137Cs concentrations suggest that a minimum detectable activity (MDA) less than 0.5Bq/kg is required for detection of 137Cs activity in topsoils in the lowest reference inventory areas. This sensitivity should allow, at present, 137Cs to be a useful tool for analysis of soil erosion in Southeast Asia, should also be a useful chronometer, and will be a useful tracer at least where the reference inventory is more than 500-600Bq/m2. This level of MDA has been demonstrated in previous studies to be achievable by gamma-ray spectrometry using non-destructive sample treatment. As the nuclide decays, sufficient will remain to be useful until the middle of this century in most areas in Peninsular Malaysia and southern maritime Southeast Asia, and a few decades more in the rest of the region. © 2013 Elsevier Ltd.
Details
- Title
- Caesium-137 in Southeast Asia: Is there enough left for soil erosion and sediment redistribution studies?
- Authors
- Takahisa Furuichi (Author) - Kyoto University, JapanR J Wasson (Author) - National University of Singapore, Singapore
- Publication details
- Journal of Asian Earth Sciences, Vol.77, pp.108-116
- Publisher
- Pergamon
- DOI
- 10.1016/j.jseaes.2013.08.012
- ISSN
- 1367-9120
- Organisation Unit
- University of the Sunshine Coast, Queensland; Sustainability Research Centre
- Language
- English
- Record Identifier
- 99449814402621
- Output Type
- Journal article
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