辐射防护通讯
輻射防護通訊
복사방호통신
RADIATION PROTECTION BULLETIN
2014年
3期
16-19
,共4页
花正东%洪韵%眭光凯%戴继伟
花正東%洪韻%眭光凱%戴繼偉
화정동%홍운%휴광개%대계위
辐射剂量率%土壤%转换系数%EGS
輻射劑量率%土壤%轉換繫數%EGS
복사제량솔%토양%전환계수%EGS
Photon dose rate%Soil%Conversion coefficient%EGS
基于镜像、积分原理,采用EGS蒙特卡罗程序对土壤中光子致地表光子辐射剂量率的转换系数进行了模拟计算,给出了能量50 keV~3 MeV光子的转换系数。与其他研究者的计算结果相比,除0.2、0.4 MeV两个能量点的值相对偏差较大(25%)外,其余均小于15%。依据该转换系数计算了土壤中单位比活度的天然放射性核素所致的地表光子辐射剂量率,与其他研究者计算结果的相对偏差小于10%。
基于鏡像、積分原理,採用EGS矇特卡囉程序對土壤中光子緻地錶光子輻射劑量率的轉換繫數進行瞭模擬計算,給齣瞭能量50 keV~3 MeV光子的轉換繫數。與其他研究者的計算結果相比,除0.2、0.4 MeV兩箇能量點的值相對偏差較大(25%)外,其餘均小于15%。依據該轉換繫數計算瞭土壤中單位比活度的天然放射性覈素所緻的地錶光子輻射劑量率,與其他研究者計算結果的相對偏差小于10%。
기우경상、적분원리,채용EGS몽특잡라정서대토양중광자치지표광자복사제량솔적전환계수진행료모의계산,급출료능량50 keV~3 MeV광자적전환계수。여기타연구자적계산결과상비,제0.2、0.4 MeV량개능량점적치상대편차교대(25%)외,기여균소우15%。의거해전환계수계산료토양중단위비활도적천연방사성핵소소치적지표광자복사제량솔,여기타연구자계산결과적상대편차소우10%。
The conversion coefficients of photon dose rate above ground from photon emitters in soil were cal-culated using the EGS Monte Carlo code .Calculations were performed for 16 photon energies from 50 keV to 3 MeV and for 30 plane radius from 5 cm to 200 m .The conversion of photon dose rate above ground from spe-cific activity of nuclides form 238 U decay chain ,232 Th decay chain and 40 K in soil were also given .The compar-ison between these results and the data deduced previously by other authors indicates a good agreement ,less than 10% difference .