同位素2017，Vol.30Issue(4)：249-258,10.DOI:10.7538/tws.2017.youxian.006
238Pu低能光子源衰变γ能谱识别
Identification of Gamma Spectrum Decayed by 238Pu as a Low Energy Photon Source
摘要
Abstract
The gamma spectrum of 238 Pu low energy photon source which was used for X-ray fluorescence analysis was analyzed by using P-type coaxial HPGe detector .There were characteristic rays of 233 Pa ,224 Ra ,212 Pb ,212Bi and 208 Tl in the spectrum except the characteristic gamma rays of 238 Pu .233 Pa was the decay product of 237 Np ,which was the raw material used to produce 238Pu .224Ra ,212Pb ,212Bi and 208Tl were the daughter nuclei of 236 Pu ,which was by-product in the process of 238 Pu's production .Gamma rays of 350 ,440 ,844 ,1014 ,1130 ,1266 ,1368 ,1454 keV were caused by coulomb exci-tation that alpha particles bombarded encapsulation materials of the source ,or nuclear excitation that gamma rays irradiated surroundings .After the basis of efficiency calibra-tion ,the radioactive activity of each radioactive nuclide was calculated by gamma ray spectrometry .The quality of each radioactive nuclide was calculated derived from the principle of radioactive equilibrium .Through the analysis of 238 Pu's gamma ray spec-trum ,the method to calculate the radioisotope activity and the purity of radioactive sources was offered .关键词
238Pu低能光子源/特征射线/γ能谱法/效率刻度Key words
238Pu low energy photon source/characteristic ray/gamma ray spectrome-try/efficiency calibration分类
数理科学引用本文复制引用
许旭,刘佳强,陆景彬,刘玉敏,马克岩,杨东,刘运祚..238Pu低能光子源衰变γ能谱识别[J].同位素,2017,30(4):249-258,10.基金项目
国家重大科学仪器设备开发专项(2012YQ240121) （2012YQ240121）
国家自然科学基金(11405072) （11405072）
