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KMID : 0357520210440050481
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Journal of Radiological Science and Technology
2021 Volume.44 No. 5 p.481 ~ p.487
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Evaluation of the Decontamination Efficiency of Radioactive Wastes Generated during the Production of 201-Tl
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Heo Jae-Seung
Kim Sang-Rok
Kim Gi-Sub
Ahn Yun-jin
Kim Jung-Min
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Abstract
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This study was conducted for the purpose of efficient radioactive waste disposal and management. Experiment was evaluated the decontamination efficiencies of the four types decontamination materials(Water, Alcohol, Decontamination Water, Decontamination Gel) with radioactive wastes generated during radio-pharmaceutical production process at Korea Institute Radiological and Medical Sciences(KIRAMS). The radioactive waste sample used in experiment is a lead plate of the fume hood that was disposed in April, 2019. In the experimental method, radioactive waste was measured before and after decontamination using a HPGe semiconductor detector and Gamma survey meter. The measured values before and after decontamination were evaluated for decontamination efficiency as a percentage. As a result, it was confirmed that a lot of specific activity and surface dose rate was removed from the radioactive wastes. In particular, when decontamination water was used, most of the radioactivity of radioactive wastes was removed. Considering these results, if decontamination water is used in decontamination of radioactive waste, decontamination efficiency equivalent to the disposition criteria can be expected with just one decontamination treatment.
In addition, in the case of water and alcohol, only on decontamination was effective in approximately 75% and 95%. Otherwise, when decontamination gel was used, it was confirmed that the largest deviation occurred among all experimental results.
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KEYWORD
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Radioactive Waste, 201-Tl, Decontamination, Self Disposal, Management of Radiation Safety
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