Measurement limits to Cs-134 concentration in soil

Department of Physics, Pusan National University, Pusan, Republic of Korea.
Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine (Impact Factor: 1.23). 09/2011; 69(9):1294-8. DOI: 10.1016/j.apradiso.2011.05.006
Source: PubMed


We investigate the caesium concentrations in soils in mountain areas near Gori nuclear power plant in Korea, focusing on the measurement limits to the (134)Cs. In order to lower the minimum detectable amount (MDA) of activity for the (134)Cs, we have used the ammonium molybdophosphate (AMP) precipitation method to get rid of the (40)K existing in natural radioactivity, which reduces the MDA activity about 10 times smaller than those without the AMP precipitation method. The MDA results for the (134)Cs 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 (134)Cs in the samples the MDA should be reduced to the level of mBq/kg-dry weight.

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Available from: Hahn Shik Lee, Aug 08, 2014
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    ABSTRACT: The photopeak efficiency, the peak to valley ratio, the energy resolution and the minimum detectable activity of a HPGe detector were determined experimentally for 13.81–1212.95 keV photon energy by using Am241, Ba133, Cs137 and Eu152. The photopeak efficiency was studied at the geometry with the source to detector distance of 5 cm, 10 cm, 15 cm and 20 cm. Also, it was determined theoretically. It is shown that full energy peak efficiency decreases with increases in gamma ray energy. Also, the HPGe detector offers very good resolution. This makes it a suitable detector for x- and gamma ray spectroscopy and health physics research.
    Full-text · Article · Jan 2013 · Journal of Instrumentation