原子能科学技术Issue(10)：1893-1898,6.DOI:10.7538/yzk.2015.49.10.1893
居室墙体中天然γ核素就地测量技术研究
Study on In-situ Measurement Technique of Natural γNuclide in Indoor Wall
摘要
Abstract
The in‐situ measurement of natural γ nuclide specific activity in walls was studied through theoretical calculation and experimental measurement .The method for measuring 226 Ra ,232 Th and 40 K in non‐equilibrium state was analyzed theoretically ,and the interference coefficient from 235 U when measuring 226 Ra in‐situ was estimated by laboratory measuring 234 Th which is the first generation daughter of 238 U and according to the natural isotope abundance ratio between 235 U and 238 U .The interference in meas‐urement between the walls in the same room was studied using ISOCS passive efficiency simulation .And the effects on the passive efficiency calibration from the brick shape and raw material ratio were also studied .The results show that the interference coefficient from 235 U when measuring 226 Ra in‐situ is about 0.46 ,and the deduction coefficient of 40 K when measuring the single wall by Falcon 5000 is about 0.33 under the indoor geo‐metrical condition with 8 mm tungsten shield .The total uncertainties of in‐situ meas‐urement were analyzed ,which are respectively 26% ,17% and 15% for 226 Ra ,232 Th and 40 K in indoor walls .As a conclusion ,the in‐situ measurement can be used for indoor environment survey .关键词
居室墙体/天然γ核素/比活度/就地测量Key words
indoor wall/natural γ nuclide/specific activity/in-situ measurement分类
能源科技引用本文复制引用
宋卫杰,陈凌,殷经鹏,郭金森..居室墙体中天然γ核素就地测量技术研究[J].原子能科学技术,2015,(10):1893-1898,6.基金项目
环境保护部核与辐射监管资助项目 （）
