核技术
覈技術
핵기술
NUCLEAR TECHNIQUES
2001年
2期
144-148
,共5页
137Cs%γ辐射剂量率%分布模式
137Cs%γ輻射劑量率%分佈模式
137Cs%γ복사제량솔%분포모식
我国陆地137Cs沉积所造成的γ辐射剂量率,以均匀分布模式进行估算比较合理。以此得到,我国各省的137Cs γ辐射剂量率的均值在(7—18)×10-10Gyh-1之间,约占陆地总的γ辐射剂量率的1%—3%;考虑到人口的分布,全国的平均值约为9×10-10Gyh-1,约占总γ剂量率的1.5% 左右。但最高值可达1.7×10-8Gyh-1,与其它任一天然放射性核素的贡献相接近。与此相比较,如果用张弛长度为3cm的指数分布模式估算,137Cs γ辐射剂量率的贡献比用均匀分布模式约高1倍。
我國陸地137Cs沉積所造成的γ輻射劑量率,以均勻分佈模式進行估算比較閤理。以此得到,我國各省的137Cs γ輻射劑量率的均值在(7—18)×10-10Gyh-1之間,約佔陸地總的γ輻射劑量率的1%—3%;攷慮到人口的分佈,全國的平均值約為9×10-10Gyh-1,約佔總γ劑量率的1.5% 左右。但最高值可達1.7×10-8Gyh-1,與其它任一天然放射性覈素的貢獻相接近。與此相比較,如果用張弛長度為3cm的指數分佈模式估算,137Cs γ輻射劑量率的貢獻比用均勻分佈模式約高1倍。
아국륙지137Cs침적소조성적γ복사제량솔,이균균분포모식진행고산비교합리。이차득도,아국각성적137Cs γ복사제량솔적균치재(7—18)×10-10Gyh-1지간,약점륙지총적γ복사제량솔적1%—3%;고필도인구적분포,전국적평균치약위9×10-10Gyh-1,약점총γ제량솔적1.5% 좌우。단최고치가체1.7×10-8Gyh-1,여기타임일천연방사성핵소적공헌상접근。여차상비교,여과용장이장도위3cm적지수분포모식고산,137Cs γ복사제량솔적공헌비용균균분포모식약고1배。
137Cs deposited on the Chinese land produces γ dose rate. It is fairly reasonable to estimate its contribution by using the uniform distribution model. In this study， the province averages of 137Cs γ dose rate were found to be (7—18)×10-10Gyh-1， which correspond to 1%—3% of total γ dose rate on land. The average of whole country was about 9×10-10Gyh-1 and 1.5% of total γ dose rate when took the population distribution into consideration. The maximum was 1.7×10-8Gyh-1 which approached to the contribution from any natural radionuclide series. The results for 137Cs γ dose rate estimated by using the exponential distribution model with 3cm average depth were about twice as large as those estimated by using the uniform distribution one.
