Abstract
Cesium-132 has proposed as an alternative tracer of 137Cs for environment study on radioactive cesium dynamics released by a nuclear power plant accident. In the present study, we conducted a production experiment of the 132Cs by means of accelerator-based neutron method to investigate production amount and radioactive purity. A 12-g Cs2CO3 sample was irradiated by the accelerator-based neutron via the C(d,n) reactions by 1.2 µA of 30-MeV deuterons. As a result, 102 kBq/g of 132Cs was obtained with higher than 98.5% radioactive purity. Following that, a feasibility study of cesium dynamics measurement in andosol soil was performed. We found distribution of absorption of cesium in andosol soil can be clearly measurable by the produced 132Cs tracer.
Highlights
Cesium-137 has been known as the most problematic nuclide in a nuclear accident
Huge effort has been devoted to the cesium dynamics in the environment to reveal residual distribution [5,6,7] and pollution of agricultural crops [8]
The authors measured amount of water extractive cesium from andosol soil with ICP-MS method, and as a result, only 1.3% of cesium can be extracted after 4 hours from Cs contamination
Summary
Cesium-137 has been known as the most problematic nuclide in a nuclear accident. In Fukushima Daiichi Nuclear Power Plant Accident, large amounts of radioactive nuclides including the 137Cs were released into the environment [1,2,3]. For the cesium distribution study, short-time dynamics in soil is very important to know the mechanism of cesium absorption. Takeda et al reported that almost all of cesium absorbed to soil within a few days after the contamination [9]. Rest of the cesium has been slowly absorbed and the absorption ratio reaches to 99.98% around 200 days after the contamination. Contribution of longtime distribution is less than 2% and dominant absorption phenomena are finished in only a few days
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