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- 저자 : Njock Moïse Godefroy Kwato (검색결과 1 건)
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Nkoulou II Joseph Emmanuel Ndjana,Engola Louis Ngoa,Dallou Guy Blanchard,Saïdou,Bongue Daniel,Hosoda Masahiro,Njock Moïse Godefroy Kwato,Tokonami Shinji 대한방사선방어학회 2023 방사선방어학회지 Vol.48 No.2
Background : This study aims to reevaluate natural radiation exposure , following up on our previous study conducted in 2019 , and to assess the associated risk of lung cancer to the public residing in the gold mining areas of Betare-Oya , east Cameroon , and its vicinity. Materials and Methods : Gamma-ray spectra collected using a 7 . 62 cm × 7 . 62 cm in NaI(Tl) scintillation spectrometer during a car-borne survey, in situ measurements and laboratory mea- surements performed in previous studies were used to determine the outdoor absorbed dose rate in air to evaluate the annual external dose inhaled by the public . For determining internal exposure , radon gas concentrations were measured and used to estimate the inhalation dose while considering the inhalation of radon and its decay products . Results and Discussion : The mean value of the laboratory-measured outdoor gamma dose rate was 47 nGy/hr, which agrees with our previous results (44 nGy/hr) recorded through direct mea- surements (in situ and car-borne survey) . The resulting annual external dose (0 . 29 ± 0 . 09 mSv/yr) obtained is similar to that of the previous study (0 . 33 ± 0 . 03 mSv/yr) . The total inhalation dose resulting from radon isotopes and their decay products ranged between 1 . 96 and 9 . 63 mSv/yr with an arithmetic mean of 3 . 95 ± 1 . 65 mSv/yr. The resulting excess lung cancer risk was esti- mated ; it ranged from 62 to 216 excess deaths per million persons per year (MPY) , 81 to 243 ex- cess deaths per MPY, or 135 excess deaths per MPY, based on whether risk factors reported by the U. S . Environmental Protection Agency, United Nations Scientific Committee on the effects of Atomic Radiation , or International Commission on Radiological Protection were used , re- spectively. These values are more than double the world average values reported by the same agencies . Conclusion : There is an elevated level of risk of lung cancer from indoor radon in locations close to the Betare-Oya gold mining region in east Cameroon . Therefore , educating the public on the harmful effects of radon exposure and considering some remedial actions for protection against radon and its progenies is necessary.
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