Nuclear Engineering and Technology

  • 제50권5호
  • /
  • Pages.806-813
  • /
  • 2018
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  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Analysis and radiation dose assessment of 222Rn in indoor air at schools: Case study at Ulju County, Korea

  • Lee, ChoongWie (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Choi, Sungyeol (Department of Nuclear & Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Hee Reyoung (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology)
  • 투고 : 2017.12.26
  • 심사 : 2018.03.25
  • 발행 : 2018.06.25
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초록

$^{222}Rn$ exists in nature in the form of a rare radioactive gas. In terms of environmental radiation, issues regarding $^{222}Rn$ have persisted because of its radiological hazardousness. Ulju County is one of the regions of Ulsan metropolitan city, with a population of 227,699. Ulju County has the highest density of industrial complexes in Korea. In this study, $^{222}Rn$ radioactivity concentration was measured and analyzed in 57 schools in Ulju County using 114 passive LR-115 type detectors to secure radiological safety and confirm basic information for reduction of resident exposure to $^{222}Rn$. The effective dose of $^{222}Rn$ was assessed to find the actual risk of the concentration surveyed in schools to human beings. The dose depended on four factors: subjects, $^{222}Rn$ concentration, dose coefficient, and time. The individuals subjected to dose estimation were classified into three types: students, teachers, and office workers. The subjects had different dwelling locations and times. The findings demonstrate that the radiological hazard to students and workers at schools in Ulju County owing to $^{222}Rn$ is negligible in terms of $^{222}Rn$ activity recommendation level.

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