本文件规定了X和伽马参考辐射的特性和生产方法，用于根据国际辐射单位和测量委员会（ICRU）[5]的幻象相关操作量校准防护级剂量计和剂量率计。本标准适用的最低空气比释动能率为1µGy h–1。低于该空气比释动能率（kerma rate）时，需要特别考虑（自然）背景辐射，本文件不包括这一点。 购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the characteristics and production methods of X and gamma reference radiation for calibrating protection-level dosemeters and doserate meters with respect to the phantom related operational quantities of the International Commission on Radiation Units and Measurements (ICRU)[5]. The lowest air kerma rate for which this standard is applicable is 1 µGy h–1. Below this air kerma rate the (natural) background radiation needs special consideration and this is not included in this document.All current amendments available at time of purchase are included with the purchase of this document.