CAJ | 학술논문

目的研究氡析出对居室建材外照射剂量模型的影响,为准确评价建材放射性外照射危害提供依据.方法分析建材中氡的析出机制,推导建材单位比活度226 Ra所致外照射剂量率氡析出修正因子的数学模型,利用Matlab程序解析计算、探讨氡析出修正因子与扩散长度、氡面发射系数以及建材厚度的关系.计算、比较部分建材在修正与未修正氡析出影响下所致的吸收剂量率.结果建材单位比活度226Ra所致吸收剂量率的氡析出修正因子与扩散长度、建材厚度不相关,与发射系数负相关,在数值上等于“1-FRn”(FRn为氡面发射系数).在修正与未修正氡析出影响两种情况下,部分建材所致吸收剂量率的相对百分偏差为2.23％～ 10.02％.结论建材氡的析出对其外照射辐射剂量模型有一定影响,可选取氡析出修正因子为“1-FRn”进行修正,从而更科学地评价建材外照射危害.
목적 연구동석출대거실건재외조사제량모형적영향,위준학평개건재방사성외조사위해제공의거.방법 분석건재중동적석출궤제,추도건재단위비활도226 Ra소치외조사제량솔동석출수정인자적수학모형,이용Matlab정서해석계산、탐토동석출수정인자여확산장도、동면발사계수이급건재후도적관계.계산、비교부분건재재수정여미수정동석출영향하소치적흡수제량솔.결과 건재단위비활도226Ra소치흡수제량솔적동석출수정인자여확산장도、건재후도불상관,여발사계수부상관,재수치상등우“1-FRn”(FRn위동면발사계수).재수정여미수정동석출영향량충정황하,부분건재소치흡수제량솔적상대백분편차위2.23％～ 10.02％.결론 건재동적석출대기외조사복사제량모형유일정영향,가선취동석출수정인자위“1-FRn”진행수정,종이경과학지평개건재외조사위해.
Objective To study the effect of radon exhalation on the external dose model for building material,so as to provide the scientific and precise assessment of external radiation exposure hazard.Methods The mechanism of exhalation of radon from building material was analyzed,mathematical model of correction factor for the effect of radon exhalation was derived and resolved by Matlab program and the relationship between correction factor and diffusion length,surface emanation coefficient and thickness of building material was discussed.The absorbed dose rate induced by several classical building materials was calculated and compared.Results The radon exhalation correction factor was independent of diffusion length and thickness of building material in most cases.Negative correlation was found between radon exhalation correction factor and radon surface emanation coefficient.Radon exhalation correction factor numerically equals to '1-radon surface emanation coefficient'.The relative percentage deviation between absorbed dose rate induced by several classical building materials was in the range of 2.23％-10.02％,for both corrected and uncorrected radon exhalation effects.Conclusions Radon exhalation from building material has a certain effect on external dose model for building material,which should attract attention.It is important to conduct the correction for external dose model by introducing ‘1 -radon surface emanation coefficient’ as the radon exhalation correction factor,in order for the scientific assessment and control of external radiation exposure hazards from building materials.