NF EN ISO 21909-2, M61-101-2 (07/2023)

This document provides methodologies and criteria to qualify the dosimetric system at the workstations at which it is used. The criteria provided in this document apply to dosimetric systems not conforming to the criteria described in ISO 21909-1 regarding the dependence of responses on the energy and directional distributions of neutron fluence. The qualification of the dosimetric system at the workstation aims to demonstrate that: — either the non-compliance of the dosimetric system with respect to certain of the requirements concerning energy or direction dependent responses defined in ISO 21909 -1 does not lead to significant deviations in the determination of the dose for a certain workplace field; — either the correction factor or function used for this specifically studied workstation allows the dosimetric system to accurately determine the conventional dose value with uncertainties similar to those indicated in ISO 21909-1. NOTE This document is addressed to all parties involved: dosimetry laboratories, accreditation or regulatory bodies and users of particular dosimetric systems (the user is the entity that assigns the dosimetry system to the radiation worker and records the assigned dose). The methodologies for characterizing the field of a workstation to qualify the dosimetric system are described in Appendix A. Appendix B is complementary because it specifies the practical methods to follow, once the methodology has been chosen. The supplier of the dosimetric system must communicate the results of type tests corresponding to ISO 21909-1. However, if the dosimetric system to be qualified does not meet all the criteria of ISO 21909-1 dealing with the energy and angular dependence of the response, certain tests of ISO 21909-1 may not be carried out. The links between ISO 21909-1 and ISO 21909-2 are described in Annex E. This document only addresses individual neutron dose monitoring, not criticality accident conditions.
(Automatic translation from French)