土壤中~（134）Cs浓度的测量限值
Measurement Limits to 134Cs Concentration in Soil
摘要：
我们调查了韩国哥里核电站附近山区土壤中的铯浓度，重点是对134 Cs的测量极限。为了降低~（134）Cs活度的最小可检出量（MDA），我们采用磷酸铵（AMP）沉淀法去除天然放射性中的~（40）K，使~（134）Cs活度降低约10倍。发现134 Cs的MDA结果在0.015和0.044 Bq/kg干重之间。为了减少背景，我们还测量了韩国东海岸的一个小镇阳阳的一部分土壤样品。然而，为了检测样品中的134 Cs，MDA应降低到mBq/kg干重的水平。
英文摘要：
We investigate the caesium concentrations in soils in mountain areas near Gori nuclear power plant in Korea, focusing on the measurement limits to the 134Cs. In order to lower the minimum detectable amount (MDA) of activity for the 134Cs, we have used the ammonium molybdophosphase (AMP) precipitation method to get rid of the 40K existing in natural radioactivity, which reduces the MDA activity about ten times smaller than those without the AMP precipitation method. The MDA results for the 134Cs were found to be in the range between 0.015 and 0.044 Bq/kg-dry weight. In order to diminish the background, we also have measured a part of the soil samples in Yangyang, a small town in the east coast of Korea. However, it turns out that in order to detect the 134Cs in the samples the MDA should be reduced to the level of mBq/kg-dry weight.
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