计量学报2016，Vol.37Issue(z1)：89-94,6.DOI:10.3969/j.issn.1000-1158.2016.z1.21
制备放射性标准物质用SiO2基质中放射性核素比活度的测定
Determination for the Specific Activity of the SiO2 Matrix for Preparation of Radioactive Standard Materials
摘要
Abstract
The lower limit of activity detection as low as mBq is used to measure SiO2,which is commonly used in the preparation of radioactive reference materials.The detection efficiency of the spectrometer system was calibrated with the standard source,and the specific activity of the natural radionuclide contained in the sample was determined by selfabsorption and coincidence summing correction as well as the evaluation of uncertainty.The measuring results show that on the condition of the measuring time is up to 559200s and the uncertainty of specific activity of the natural radionuclide lower than 10％ (k=2),the specific activity of SiO2 in uranium series,thorium series and actinium series is under 10 Bq/kg individually.The specific activity of radionuclide K-40 is 27.3 Bq/kg,which shows that the effect of the content of radionuclide in the matrix needs to be taken into consideration when preparing standard materials with low specific activity.关键词
计量学/γ谱仪/放射性核素/比活度/标准物质/不确定度Key words
metrology/Gamma-spectrometer/specific activity/radionuclide/standard material/uncertainty分类
通用工业技术引用本文复制引用
范梓浩,梁珺成,刘皓然,王仁波,曾志,马豪,张明,袁大庆..制备放射性标准物质用SiO2基质中放射性核素比活度的测定[J].计量学报,2016,37(z1):89-94,6.基金项目
国家重点研发计划项目(2016YFF0200803) （2016YFF0200803）
国家自然科学基金(11505179) （11505179）
