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１问题的提出 我院附属医院核医学科使用着多种用于诊断治疗的放射性核素。每种放射性核素都有其固有的物理半衰期，不因外界环境而改变。因半衰其制约期有效期，所以一般地药物生产厂家根据其固有的物理半衰期及特定的检测目的生产一定浓度的药液使之在一个月内有效，从而制定
1 put forward the question Our hospital Affiliated Hospital of Nuclear Medicine uses a variety of radionuclides for diagnosis and treatment. Each radionuclide has its inherent physical half-life, not due to changes in the external environment. Due to the half-life of its restrictive period, it is generally in the pharmaceutical manufacturers in accordance with its inherent physical half-life and the specific test for the production of a certain concentration of the liquid so that within a month to make effective