本文件规定了中子参考辐射场，能量范围从热到20？MeV，用于校准用于辐射防护目的的中子测量装置，并确定其作为中子能量函数的响应。 本文件仅涉及产生和表征中子参考辐射场的方法。参考文献[1]和[2]描述了将这些辐射场用于校准的程序。 规定的中子参考辐射场如下: -？来自放射性核素源的中子场，包括来自慢化剂源的中子场； -？加速器带电粒子核反应产生的中子场； -？反应堆的中子场。 鉴于中子参考辐射场的产生和使用方法，为了本文件的目的，这些中子参考辐射场分为以下三个单独的条款: -？在第4条中，中子测量装置的校准规定了宽光谱放射性核素中子源。从事中子测量装置常规校准的实验室应使用这些源，其特定设计已经过型式试验。 -？在第5条中，加速器产生的单能中子和反应堆产生的具有宽谱或准单能谱的中子被指定用于确定中子测量装置作为中子能量函数的响应。由于这些中子参考辐射场是在专门且设备齐全的实验室中产生的，因此只给出了最低限度的实验细节。 -？第6条规定了热中子场。这些磁场可以由慢化放射性核素源、加速器或反应堆产生。

This document specifies the neutron reference radiation fields, in the energy range from thermal up to 20？MeV, for calibrating neutron-measuring devices used for radiation protection purposes and for determining their response as a function of neutron energy. This document is concerned only with the methods of producing and characterizing the neutron reference radiation fields. The procedures for applying these radiation fields for calibrations are described in References [1] and [2]. The neutron reference radiation fields specified are the following: —？neutron fields from radionuclide sources, including neutron fields from sources in a moderator; —？neutron fields produced by nuclear reactions with charged particles from accelerators; —？neutron fields from reactors. In view of the methods of production and use of them, these neutron reference radiation fields are divided, for the purposes of this document, into the following three separate clauses: —？In Clause？4, radionuclide neutron sources with wide spectra are specified for the calibration of neutron-measuring devices. These sources should be used by laboratories engaged in the routine calibration of neutron-measuring devices, the particular design of which has already been type tested. —？In Clause？5, accelerator-produced monoenergetic neutrons and reactor-produced neutrons with wide or quasi monoenergetic spectra are specified for determining the response of neutron？measuring devices as a function of neutron energy. Since these neutron reference radiation fields are produced at specialized and well-equipped laboratories, only the minimum of experimental detail is given. —？In Clause？6, thermal neutron fields are specified. These fields can be produced by moderated radionuclide sources, accelerators, or reactors.