随着我所辐照业务的发展壮大 ,现有钴源不能满足市场需求 ,自去年下半年以来 ,我所就一直在筹划对辐照中心进行第五次加源。由于 60 Co放射源必须从国外进口 ,国际市场货源紧张 ,通过多方联系 ,才争取到俄罗斯进口 4.3万居里钴源的合同 ,加上运输难度大 ,办理免税单和安全运输 As the business of irradiation has grown, the existing cobalt source can not meet the market demand. Since the second half of last year, I have been planning to add a fifth source to the IRC. Due to the 60 Co radioactive sources must be imported from abroad, the international market supply is tight, through multiple contacts, only to get Russia to import 4.3 million Curie cobalt source contract, coupled with the difficulty of transportation, for duty-free and safe transportation