ICRU 39号报告定义了一个称之为周围剂量当量的辐射量,即齐向扩展场AP照射条件下ICRU球体(直径30cm,密度为1g/cm~3的组织等效球体)内10mm深度处的剂量当量,用符号H~*(10)表示。按此量定度的仪器,可用来定量地估计强贯穿辐射所致有效剂量当量H_E。可是,现有中子巡测仪或雷姆仪是按ICRP 21号出版物推荐的非球形受体中的最大剂量当量H_M定度的,此类仪器可否适用于周围剂量当量测量,这个问题尚须探讨。 ICRU Report 39 defines an amount of radiation called the ambient dose equivalent at 10 mm depth within the ICRU sphere (diameter 30 cm, tissue equivalent sphere with density 1 g / cm ~ 3) in the direction of extended field AP illumination Dose equivalent, with the symbol H ~ * (10) said. According to the quantitative determination of the amount of equipment, can be used to quantitatively estimate the effective penetrating radiation dose equivalent H_E. However, existing neutron detectors or reamers are calibrated to the maximum dose equivalent, H_M, of the non-spherical receptors recommended by ICRP Publication 21, and the applicability of such instruments to ambient dose equivalence measurements Must be explored.