원전사고 후 광역의 방사성 오염부지 내 거주민에 대한시간에 따른 피폭방사선량 평가
Assessment of Temporal Trend of Radiation Dose to the Public Living in the Large Area Contaminated with Radioactive Materials after a Nuclear Power Plant Accident
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It has been about 5 years since the Fukushima nuclear power plant accident, whichcontaminated large area with radioactive materials. It is necessary to assess radiation dose toestablish evacuation areas and to set decontamination goal for the large contaminated area. Inthis study, we assessed temporal trend of radiation dose to the public living in the large areacontaminated with radioactive materials after the Fukushima nuclear power plant accident. The dose assessment was performed based on Chernobyl model and RESRAD model for twoevacuation lift areas, Kawauchi and Naraha. It was reported that deposition densities in theareas were 4.3~96 kBq m-2 for 134Cs, 1.4~300 kBq m-2 for 137Cs, respectively. Radiation dose tothe residents depended on radioactive cesium concentrations in the soil, ranging 0.11~2.4 mSvy-1 at Kawauchi area and 0.69~1.1 mSv y-1 at Naraha area in July 2014. The difference was lessthan 5% in radiation doses estimated by two different models. Radiation dose decreased withcalendar time and the decreasing slope varied depending on dose assessment models. Based onthe Chernobyl dosimetry model, radiation doses decreased with calendar time to about 65% levelof the radiation dose in 2014 after 1 year, 11% level after 10 years, and 5.6% level after 30 years. RESRAD dosimetry model more slowly decreased radiation dose with time to about 85% levelafter 1 year, 40% level after 10 years, and 15% level after 30 years. The decrease of radiation dosecan be mainly attributed into radioactive decays and environmental transport of the radioactivecesium. Only environmental transports of radioactive cesium without consideration of radioactivedecays decreased radiation dose additionally 43% after 1 year, 72% after 3 years, 80% after 10years, and 83% after 30 years. Radiation doses estimated with cesium concentration in the soilbased on Chernobyl dosimetry model were compared with directly measured radiation doses. The estimated doses well agreed with the measurement data. This study results can be applied to radiation dose assessments at the contaminated area for radiation safety assurance or emergencypreparedness.
Abstract
It has been about 5 years since the Fukushima nuclear power plant accident, whichcontaminated large area with radioactive materials. It is necessary to assess radiation dose toestablish evacuation areas and to set decontamination goal for the large contaminated area. Inthis study, we assessed temporal trend of radiation dose to the public living in the large areacontaminated with radioactive materials after the Fukushima nuclear power plant accident. The dose assessment was performed based on Chernobyl model and RESRAD model for twoevacuation lift areas, Kawauchi and Naraha. It was reported that deposition densities in theareas were 4.3~96 kBq m-2 for 134Cs, 1.4~300 kBq m-2 for 137Cs, respectively. Radiation dose tothe residents depended on radioactive cesium concentrations in the soil, ranging 0.11~2.4 mSvy-1 at Kawauchi area and 0.69~1.1 mSv y-1 at Naraha area in July 2014. The difference was lessthan 5% in radiation doses estimated by two different models. Radiation dose decreased withcalendar time and the decreasing slope varied depending on dose assessment models. Based onthe Chernobyl dosimetry model, radiation doses decreased with calendar time to about 65% levelof the radiation dose in 2014 after 1 year, 11% level after 10 years, and 5.6% level after 30 years. RESRAD dosimetry model more slowly decreased radiation dose with time to about 85% levelafter 1 year, 40% level after 10 years, and 15% level after 30 years. The decrease of radiation dosecan be mainly attributed into radioactive decays and environmental transport of the radioactivecesium. Only environmental transports of radioactive cesium without consideration of radioactivedecays decreased radiation dose additionally 43% after 1 year, 72% after 3 years, 80% after 10years, and 83% after 30 years. Radiation doses estimated with cesium concentration in the soilbased on Chernobyl dosimetry model were compared with directly measured radiation doses. The estimated doses well agreed with the measurement data. This study results can be applied to radiation dose assessments at the contaminated area for radiation safety assurance or emergencypreparedness.
참고문헌 (20)
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