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KMID : 1151820110050010005
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Journal of the Korean Society of Radiology
2011 Volume.5 No. 1 p.5 ~ p.10
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A Study on Minimum Detection Limit of Environmental Radioactivity in HPGe Detector
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Jang Eun-Sung
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Abstract
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Based on basic concept of detection limit, sample measurement time & background measurement time was considered, and MDA values according to background measurement time and sample measurement time in land samples(river soil, surface soil, drinking water, underground water, surface water, pine leaf, mugwort) analysis among environmental samples were compared. Seeing the water sample analysis result, it was shown that most of the samples were not detected, and most of the samples in land specimen analysis showed to be below the detection limit of “Ministry of Education, Science and Technology Announcement Je-2008-28-ho”, but ¹³?Cs which is one of artificial radioactive nuclide was detected in some samples. It can be traced back to 1950s and 1960s when nuclear tests were carried out in atmosphere and catastrophic Chernobyl atomic power station accident that caused fallouts in the sky, and this is common level of detection that can be observed worldwide. Seeing the result that the ¹³⁴Cs(which is a isotope of ¹³?Cs, and it has relatively short half life) was not detected in all samples, it can be considered it doesn't affect to the operation of atomic power station.
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KEYWORD
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Minimum Detectable Activity(MDA), soil sample, artificial radioactive nuclide, gamma nuclide analyzer
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