１引言在１９８９年到１９９３年的任期中，ＩＣＲＰ第４分委员会的一个工作重点是审查有关委员会建议书的一系列修改稿，它们终于在１９９０年被委员会采纳，并于１９９１年初出版。同时，分委员会也有３个任务组在努力完成他们的工作，这些工作以第６３号、６４号和６５... 1 Introduction During the 1989-93 term of office, a focus of ICRP Subcommittee 4 was to review a series of revisions to the Commission’s recommendations, which were finally adopted by the Commission in 1990 and published in early 1991. At the same time, there are also three task forces in the subcommittee that are trying their best to finish their work. These tasks are No. 63, No. 64 and No. 65 ...