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国际辐射单位与测量委员会(简称ICRU)于1985年2月发表了第39号报告,题为“外部辐射源产生的剂量当量的测定”。该报告在引入两类辐射和两种辐射场的概念之后,
The International Commission on Radiological Units and Measurements (ICRU) published Report No. 39 in February 1985 entitled “Determination of Dose Equivalents Derived from External Sources of Radiation.” After the report introduced the concept of two types of radiation and two kinds of radiation fields,