인산석고 취급공정에서의 라돈농도 및 유효선량 수준 평가

정은교; 장재길; 김종규; 김준범; 권지운

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자료유형: 학술저널

저자정보: 정은교 (한국산업안전보건공단 산업안전보건연구원) 장재길 (한국산업안전보건공단 산업안전보건연구원) 김종규 (한국산업안전보건공단 산업안전보건연구원) 김준범 (한국산업안전보건공단 산업안전보건연구원) 권지운 (한국산업안전보건공단 산업안전보건연구원)

저널정보: 한국산업보건학회 (구 한국산업위생학회) 한국산업보건학회지 한국산업보건학회지 제28권 제3호

발행연도: 2018.1

수록면: 283 - 291 (9page)

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Objectives: To monitor the radon concentration level in plants that handle phosphorus rock and produce gypsum board and cement, and evaluate the effective dose considering the effect of radon exposure on the human body. Methods: Airborne radon concentrations were measured using alpha-track radon detectors (${\alpha}$-track, Rn-tech Co., Korea) and continuous monitors (Radon Sentinel 1030, Sun Nuclear Co., USA). Radon concentrations in the air were converted to radon doses using the following equation to evaluate the human effects due to radon. H (mSv/yr) = Radon gas concentration x Equilibrium factor x Occupancy factor x Dose conversion factor. The International Commission on Radiological Protection (ICRP) used $8nSv/(Bq{\cdot}hr/m^3)$ as the dose conversion factor in 2010, but raised it by a factor of four to $33nSv/(Bq{\cdot}hr/m^3)$ in 2017. Results: Radon concentrations and effective doses in fertilizer manufacturing process averaged $14.3(2.7)Bq/m^3$ ($2.0-551.3Bq/m^3$), 0.11-0.54 m㏜/yr depending on the advisory authority and recommendation year, respectively. Radon concentrations in the gypsum-board manufacturing process averaged $14.9Bq/m^3$ at material storage, $11.4Bq/m^3$ at burnability, $8.1Bq/m^3$ at mixing, $10.0Bq/m^3$ at forming, $8.9Bq/m^3$ at drying, $14.7Bq/m^3$ at cutting, and $10.5Bq/m^3$ at shipment. It was low because it did not use phosphate gypsum. Radon concentrations and effective doses in the cement manufacturing process were $23.2Bq/m^3$ in the stowage area, $20.2Bq/m^3$ in the hopper, $16.8Bq/m^3$ in the feeder and $11.9Bq/m^3$ in the cement mill, marking 0.12-0.63 m㏜/yr, respectively. Conclusions: Workers handling phosphorous gypsum directly or indirectly can be assessed as exposed to an annual average radon dose of 0.16 to 2.04 mSv or 0.010 to 0.102 WLM (Working Level Month).

#Dose conversion factor #ICRP #NORM

참고문헌 (32)

참고문헌 신청

Abo-Elmagd M / 2006 / External and internal exposure to natural radiations inside ancient Egyptian tombs in Saqqara / Radiat. Meas. 41(2):197~200

Abo-Elmagd M / 2014 / Development of a model using the MATLAB System identification toolbox to estimate Rn-222 equilibrium factor from CR-39 based passive measurements / Journal of Environmental Radioactivity 138:33~37

Baldauf RW / 2016 / Ultrafine Particle Metrics and ResearchConsiderations: Review of the 2015 UFP Workshop / Int. J. Environ. Res. Public Health 13:1054~1074

Celebi N / 2014 / Indoor radon measurements in turkey dwellings / Radiat. Prot. Dosim.

Chang BU / 2011 / The current status of NORM/TENORM industries and establishment of regulatory framework in Korea / Radiation Protection Dosimetry 146(1-3):170~173

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