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BS ISO 8529-1:2021

BS ISO 8529-1:2021

$167.15

Neutron reference radiations fields – Characteristics and methods of production

Published By Publication Date Number of Pages
BSI 2021 40
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Broad spectrum neutron reference radiation fields produced with radionuclide sources
4.1 Overview
4.2 Types of calibration sources
12 4.3 Source shape and encapsulation
4.4 Photon component of the neutron field
13 4.5 Energy distribution of neutron source emission rate
4.6 Neutron fluence rate produced by a source
14 4.7 Determination of the neutron source emission rate
4.8 Irradiation facility
15 5 Reference fields for the determination of the response of neutron‑measuring devices as a function of neutron energy
5.1 Overview
5.2 General properties
16 5.3 Neutron reference radiation fields produced with particle accelerators
5.3.1 General requirements
5.3.2 Energy of charged particles
17 5.3.3 Neutron spectrum
5.3.4 Parasitic and scattered neutron background
5.3.5 Neutron fluence measurement and monitoring
18 5.4 Neutron reference radiation fields produced with reactors
5.4.1 General requirements
5.4.2 Production and monitoring
6 Thermal neutron reference radiation fields
20 Annex A (informative) Tabular and graphical representation of the neutron spectra for radionuclide sources
22 Annex B (normative) Energy distribution of the neutron emission rate for the 252Cf source
24 Annex C (informative) Characteristics of D2O-moderated 252Cf sources
28 Annex D (informative) Characteristics of 241Am-Be sources
32 Annex E (informative) Angular source emission rate characteristics of radionuclide neutron sources
35 Annex F (normative) Conventional thermal-neutron fluence rate
36 Bibliography

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BS ISO 8529-1:2021
$167.15