Aluminum is the primary structural material in nuclear engineering,and its cross section induced by 14-MeV neutrons is of great significance.To address the issue of insufficient accuracy for the^(27)Al(n,2n)^(26)Al re...Aluminum is the primary structural material in nuclear engineering,and its cross section induced by 14-MeV neutrons is of great significance.To address the issue of insufficient accuracy for the^(27)Al(n,2n)^(26)Al reaction cross section,the activation method and accelerator mass spectrometry(AMS)technique were used to determine the^(27)Al(n,2n)^(26)Al cross section,which could be used as a D-T plasma ion temperature monitor in fusion reactors.At the China Academy of Engineering Physics,neutron activation was performed using a K-400 neutron generator produced by the T(d,n)4He reaction.The^(26)Al∕^(27)Al isotope ratios were measured using the newly installed GYIG 1 MV AMS at the Institute of Geochemistry,Chinese Academy of Sciences.The neutron flux was monitored by measuring the activity of 92mNb produced by the 93Nb(n,2n)92mNb reaction.The measured results were compared with available data in the experimental nuclear reaction database,and the measured values showed a reasonable degree of consistency with partially available literature data.The newly acquired cross-sectional data at 12 neutron energy points through systematic measurements clarified the divergence,which has two different growth trends from the existing experimental values.The obtained results are also compared with the corresponding evaluated database,and the newly calculated excitation functions with TALYS−1.95 and EMPIRE−3.2 codes,the agreement with CENDL−3.2,TENDL-2021 and EMPIRE−3.2 results are generally acceptable.A substantial improvement in the knowledge of the^(27)Al(n,2n)^(26)Al reaction excitation function was obtained in the present work,which will lay the foundation for the diagnosis of the fusion ion temperature,testing of the nuclear physics model,evaluation of nuclear data,etc.展开更多
A study on the anthropogenic 129I in the environments around the high radioactivity sites has been carried out. The samples were collected from the surface waters and ground waters. 129I contents in the samples were m...A study on the anthropogenic 129I in the environments around the high radioactivity sites has been carried out. The samples were collected from the surface waters and ground waters. 129I contents in the samples were measured using the AMS system at the China Institute of Atomic Energy. The 129I contents in The measured samples around the high radioactivity sites range from 108 atoms/l to 109 atoms/l. The result shows that 129I contents in the water samples collected in the vicinity of high radio-activity sites is many orders of magnitude higher than the content in the original rain water. 129I may be used as an environment monitor around the nuclear sites.展开更多
目的:分析Prolift(Prolift Pelvic Floor)和AMS(AMS Peep Connection Tool)两种盆底修复系统治疗女性盆腔器官脱垂(pelvic organ prolapse,POP)的临床疗效以及并发症的差异。方法:选取南京医科大学附属南京妇幼保健院2010年11月—2013年...目的:分析Prolift(Prolift Pelvic Floor)和AMS(AMS Peep Connection Tool)两种盆底修复系统治疗女性盆腔器官脱垂(pelvic organ prolapse,POP)的临床疗效以及并发症的差异。方法:选取南京医科大学附属南京妇幼保健院2010年11月—2013年6月收治的60例POP患者,随机分为Prolift组和AMS组,Prolift组29例,AMS组31例。比较2组患者的临床疗效和并发症。结果:2组患者的手术时间、术中出血量、术后最高体温、尿管留置时间、残余尿量及住院时间比较差异均无统计学意义(P>0.05);排尿困难、会阴部下腹坠胀、网片暴露、阴道壁膨出等术后并发症在2组患者间差异也无统计学意义(P>0.05),Prolift组患者的疼痛及性生活质量下降的发生率显著高于AMS组(P<0.05)。结论:应用Prolift和AMS两种盆底修复系统治疗POP,均能实现盆底解剖重建和功能恢复,但AMS比Prolift更具优势。展开更多
基金the Open Project of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology(NLK 2022-04)the Central Government Guidance Funds for Local Scientific and Technological Development,China(No.Guike,ZY22096024)+1 种基金the National Natural Science Foundation of China(12065003)Guangxi Key R&D Project(2023AB07029).
文摘Aluminum is the primary structural material in nuclear engineering,and its cross section induced by 14-MeV neutrons is of great significance.To address the issue of insufficient accuracy for the^(27)Al(n,2n)^(26)Al reaction cross section,the activation method and accelerator mass spectrometry(AMS)technique were used to determine the^(27)Al(n,2n)^(26)Al cross section,which could be used as a D-T plasma ion temperature monitor in fusion reactors.At the China Academy of Engineering Physics,neutron activation was performed using a K-400 neutron generator produced by the T(d,n)4He reaction.The^(26)Al∕^(27)Al isotope ratios were measured using the newly installed GYIG 1 MV AMS at the Institute of Geochemistry,Chinese Academy of Sciences.The neutron flux was monitored by measuring the activity of 92mNb produced by the 93Nb(n,2n)92mNb reaction.The measured results were compared with available data in the experimental nuclear reaction database,and the measured values showed a reasonable degree of consistency with partially available literature data.The newly acquired cross-sectional data at 12 neutron energy points through systematic measurements clarified the divergence,which has two different growth trends from the existing experimental values.The obtained results are also compared with the corresponding evaluated database,and the newly calculated excitation functions with TALYS−1.95 and EMPIRE−3.2 codes,the agreement with CENDL−3.2,TENDL-2021 and EMPIRE−3.2 results are generally acceptable.A substantial improvement in the knowledge of the^(27)Al(n,2n)^(26)Al reaction excitation function was obtained in the present work,which will lay the foundation for the diagnosis of the fusion ion temperature,testing of the nuclear physics model,evaluation of nuclear data,etc.
文摘A study on the anthropogenic 129I in the environments around the high radioactivity sites has been carried out. The samples were collected from the surface waters and ground waters. 129I contents in the samples were measured using the AMS system at the China Institute of Atomic Energy. The 129I contents in The measured samples around the high radioactivity sites range from 108 atoms/l to 109 atoms/l. The result shows that 129I contents in the water samples collected in the vicinity of high radio-activity sites is many orders of magnitude higher than the content in the original rain water. 129I may be used as an environment monitor around the nuclear sites.
文摘目的:分析Prolift(Prolift Pelvic Floor)和AMS(AMS Peep Connection Tool)两种盆底修复系统治疗女性盆腔器官脱垂(pelvic organ prolapse,POP)的临床疗效以及并发症的差异。方法:选取南京医科大学附属南京妇幼保健院2010年11月—2013年6月收治的60例POP患者,随机分为Prolift组和AMS组,Prolift组29例,AMS组31例。比较2组患者的临床疗效和并发症。结果:2组患者的手术时间、术中出血量、术后最高体温、尿管留置时间、残余尿量及住院时间比较差异均无统计学意义(P>0.05);排尿困难、会阴部下腹坠胀、网片暴露、阴道壁膨出等术后并发症在2组患者间差异也无统计学意义(P>0.05),Prolift组患者的疼痛及性生活质量下降的发生率显著高于AMS组(P<0.05)。结论:应用Prolift和AMS两种盆底修复系统治疗POP,均能实现盆底解剖重建和功能恢复,但AMS比Prolift更具优势。
