１引言源器官中某一放射性核素对靶器官产生的当量剂量与该源器官中放射性核素的核变化总数和在靶器官中被吸收的发射能量的份额成比例。在所考虑的时间间隔内体内任一源器官或组织的核变化数是在这段时间内那个器官或组织中放射性核素活度的时间积分。靶器官或组织从源器... 1 Introduction The equivalent dose of a radionuclide to a target organ in a source organ is proportional to the total number of radionuclide nuclear changes in that source organ and the fraction of the emitted energy that is absorbed in the target organ. The number of nuclear changes in any organ or tissue in the body at any given time interval is the time integral of radionuclide activity in that organ or tissue during that time period. Target organ or tissue from the source ...