【摘要】 利用２００ＭｅＶ电子束经不同厚度的高纯钨片转换得到的韧致辐射束诱发(19)Ｆ（ｒ，ｎ）(18)Ｆ和(12)Ｃ（ｒ，ｎ）(11)Ｃ反应，通过测定(18)Ｆ和(11)Ｃ的产额得到了转换靶钨片的最佳厚度，并与计算值进行了比较。测定了样品与转换靶的间距与产额的关系，推算了利用光子活化的方法分析Ｆ和Ｃ两种元素的探测下限分别为２．０ｎｇ和３．６ｎｇ。更多还原

【Abstract】 The irradiation conditions of the bremsstrahlung converted from 200MeVelectron beam at National Synchtrotyon Radiation Laboratory by tungsten converterwas studied through experimental method it was found that with 4.2-5.2mm-thicktungsten converter, the highest photonuclear reaction yields could be obtained, andthe yield decreased with increasing distance between the sample and the converterwhen the distance was less than 15cm. At present condition, the detedction limits ofC and F are 3.6 and 2.0ng respectively, when the samples are irradiated for 30minwhich is the normal injection time of NSRL.更多还原