~(109)Cd核素及其低能γ和X射线源的研制
PRODUCTION OF ~(109)Cd AND ITS LOW-ENERGY γ AND X-RAY SOURCES
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摘要: 本文介绍了在国产1.2m回旋加速器上通过~(109)Ag(d,2n)~(109)Cd核反应,从12.3MeV氘核辐照过的天然银靶中分离与制备无载体~(109)Cd的程序。银靶用HNO_3溶解后,利用金属铜经过电化学置换把银除去,再在混合的HNO_3/HBr介质中通过阴离子交换将~(109)Cd与Cu,~(65)Zn等其它元素定量分离。在制得的~(109)Cd产品中无其它放射性杂质存在(~(109)Cd>99.9%),~(109)Cd的回收率为99%。用陶瓷片吸附或电镀法制得了~(109)Cd的低能Υ和X射线源。Abstract: A procedure is presented for the production and separation of carrier-free ~(109)Cd from irradiated natural silver target with 12.3 MeV deuterons via the ~(109)Ag(d, 2n) ~(109)Cd reaction at a domestic 1.2m cyclotron. After the target was dissolved with HNO_3, silver was removed by electrochemical displacement with copper metal, and ~(109)Cd was quantitatively separated from Cu, Zn and other elements by anion exchange in a mixed HNO_3/HBr medium. Almost no radioimpurities are present in ~(109)Cd obtained (~(109)Cd>99.9%). The recovery is 99%. The low-energy γ and X-ray source of ~(109)Cd is prepared by adsorbing ~(109)Cd on a ceramic disk or electroplating method.