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Report No.

ICRU review of operational quantities for external radiation exposure; Time for a change ?

Bartlett, D.*; Dietze, G.*; Hertel, N.*; Bordy, J.-M.*; Endo, Akira   ; Gualdrini, G.*; Pelliccioni, M.*; Ambrosi, P.*; Siebert, B.*; Veinot, K.*; Ferrari, P.*; Otto, T.*

The ICRU operational quantities for area and personal monitoring have been in use for more than 20 years and are currently under review by an ICRU committee. Special attention has been given to inconsistencies in the application of these quantities and the relationship of the existing operational quantities to the newly released ICRP116 conversion coefficients for equivalent dose and effective dose. Previously reference values of these quantities were computed using the kerma approximation for photons and neutrons incident on the ICRU phantom. The kerma approximation is not applicable when the range of secondary charged particles in the phantom is greater than the depth at which the absorbed dose is being computed. Various options in the definitions of the operational quantities and their application are being considered. The current status of the report will be presented in light of the special consideration that is required to minimize the impact on radiation monitoring practice.



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