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硼中子俘获疗法(boron neutron capture therapy,BNCT)是一种可以选择性杀伤肿瘤细胞的放射疗法,硼(10 B)化合物携带剂注入人体后,会选择性富集于肿瘤细胞,与中子发生俘获反应,释放α粒子和7Li粒子杀死肿瘤。BNCT以靶向治疗、低毒高效等优势成为了放射治疗领域的新型手段。从上世纪开始,硼中子俘获疗法已在世界各国崭露头角并逐渐发展起来,已经能够成功治疗脑胶质瘤、黑色素瘤等多种疾病。目前,BNCT面临着如何研发创新更高效的含硼药物,建立更为精确的硼剂量测量体系,以及医用中子源如何摆脱核反应堆等问题。本文对BNCT的原理、优势、进展以及所面临的问题进行简要综述与探究。 相似文献
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本文研究了水溶液中2.4-二羟基肉桂酸和7-羟基香豆素对dTMP的辐射保护效应,结果表明羟基肉桂酸衍生物对dTMP均有显著的保护作用,而且其酸类衍生物的保护效应优于其相应的内酯。 相似文献
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可吸附有机卤素(AOX)是一项表征有机卤化物的国际性水质指标。建立了中子活化分析水体AOX的方法,对氯、溴、碘的检出限分别为60 ng、15 ng和6 ng。采用中子活化技术测定了某纸浆厂污水和医院污水可吸附有机卤素的含量,结果表明,纸浆厂和医院污水中的有机卤素污染问题不容忽视。 相似文献
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用时间分辨激光光解技术对富勒烯水溶性衍生物C_(70)富勒醇[C_(70)(OH)_m]研究发现,与通常富勒烯衍生物,如C_(60)[C(COOEt)_2]_n,C_(60)(C_4H_6O),C_(60)(C_3H_7N)在溶液中光解常产生激发三重态不同,C_(70)富勒醇能被248nm激光单光子电离。以KI溶液为参照,测定其水合电子的量子产额(Ф_(e-))为0.11。将激光光解与SO~-的氧化对比,确认了到C_(70)富勒醇阳离子自由基的吸收峰。 相似文献
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APPLICATION OF NUCLEAR ANALYSIS TECHNIQUES IN STUDY OF ENVIRONMENTAL POLLUTION IN THE VICINITY OF SHANGHAI 总被引:2,自引:0,他引:2
Aerosol samples were collected from three typical areas during three years: 1) north suburb of Shanghai city (NSSC); 2) north part of Shanghai city; 3) a lead-zinc smeltery and its surrounding areas. The hair samples were collected from lead-exposed workers and control people. Aerosol samples have been analyzed by PIXE, and hair samples by EDXRF (energy-dispersive X-ray fluorescence) method. S, Cl, K, Ca, Mn, Fe, Cu, Zn, Pb etc were detected in most of the aerosol and hair samples. According to the analytical results, the compositions of NSSC aerosol samples were quite similar to those from north part of Shanghai city, both the lead concentrations of these samples were less than the limit of the National Standard (70 μ g/m3); There was serious air pollution in smeltery and its surrounding areas. Especially, the lead concentration in the aerosol exceeded 200 μg/m3; The average lead concentration of hair samples for half-year exposed group was about 3-fold higher than that of unexposed group. 相似文献
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中国五个城市的中期胎儿组织中几种元素含量的PIXE分析 总被引:1,自引:0,他引:1
应用质子激发X荧光分析法(PIXE)对我国五个城市的近50例流产胎儿(5-6个月)的肝、脑、肾、肺、胃组织进行了12种元素的含量分析,结果可见,广州地区胎儿的五个器官中的钙含量几乎均显著地低于其它四个地区(P<0.01);昆明地区胎儿的五个器官中的铷含量均显著地高于其它四个地区(P<0.01);上海地区胎儿的大部分组织中的铅含量均显著地高于其它四个地区(P<0.01)。比较胎儿元素谱与空气气液胶中 相似文献