The investigation of the impact of new ICRU95 operational quantities on the reference fields at JAEA-FRS in terms of the type-testing of the dosimeters

ICRU has published Report 95 jointly with ICRP in 2020 proposing new operational quantities. This will impact dosimetry in radiological protection especially for the dosimeters’ performance of energy and angular dependence. To test the performance in detail, it is important to establish radiation reference fields corresponding to the new quantities. The Facility of Radiation Standards (FRS) of the Japan Atomic Energy Agency is a comprehensive Secondary Standard Dosimetry Laboratory in Japan equipped with various reference fields for x-, gamma-, beta-, and neutron radiations. We evaluated the conversion coefficients in terms of the new quantities in the FRS fields and demonstrated type-testing of commercial dosimeters based on the new quantities, which made it possible to conduct the performance tests of the dosimeters in terms of the new quantities at the FRS. Significant differences between the conversion coefficients for new and existing operational quantities were found for some FRS fields, especially for x-ray fields with low energies and large angles, beta-ray fields on the operational quantities for eye lens monitoring, and neutron radiation fields. The H * and H p responses of the dosimeters were found to be affected at low-energy photon region accordingly.