ISO - 21909-1
Passive neutron dosimetry systems — Part 1: Performance and test requirements for personal dosimetry
|Publication Date:||1 December 2021|
|ICS Code (Radiation protection):||13.280|
This document provides performance and test requirements for determining the acceptability of neutron dosimetry systems to be used for the measurement of personal dose equivalent, Hp(10), for neutrons ranging in energy from thermal to 20 MeV1).
This document applies to all passive neutron detectors that can be used within a personal dosemeter in part or in all of the above-mentioned neutron energy range. No distinction between the different techniques available in the marketplace is made in the description of the tests. Only generic distinctions, for instance, as disposable or reusable dosemeters, are considered.
This document describes type tests only. Type tests are made to assess the basic characteristics of the dosimetry systems and are often ensured by recognized national laboratories
This document does not present performance tests for characterizing the degradation induced by the following:
- intrinsic temporal variability of the quality of the dosemeter supplied by the manufacturer;
- intrinsic temporal variability of preparation treatments (before irradiation and/or before reading), if existing;
- intrinsic temporal variability of reading process;
- degradation due to environmental effects on the preparation treatments, if existing;
- degradation due to environmental effects on the reading process.
This document gives information for extremity dosimetry in the Annex C, based on recommendations given by ICRU Report 66. This document addresses only neutron personal monitoring and not criticality accident conditions.
The links between this document and ISO 21909-2 are given in Annex A.
1) This maximal limit of the energy range is only an order of magnitude. The reference radiation fields used for the performance tests are those defined in ISO 8529-1. This means that the maximal energies could only be 14,8 MeV or 19 MeV. This document gives performance requirements to 14,8 MeV which is the typical neutron energy encountered for fusion. For fission spectra, the highest energies are around 20 MeV but the contribution to dose equivalent coming from neutrons with energy higher than 14,8 MeV is negligible.