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Radiation Protection Dosimetry 54:167-173 (1994)
© 1994 Oxford University Press

Aspects of ICRP 60 and ICRU 47 Relevant to Individual Monitoring of External Exposure

G. Dietze and H.G. Menzel (INVITED)

Individual monitoring for external ionising radiations is required for persons who are occupationally exposed to radiation. The primary function of individual monitoring is providing information for the control of exposures and estimating the dose received by the individual. Individual monitoring as practised is based on a radiation protection concept which includes a hierarchy of dose quantities. Exposure limits recommended by the ICRP and used in regulations are expressed in risk related quantities such as effective dose or effective dose equivalent. Operational quantities such as ambient dose equivalent or personal dose equivalent are defined in phantoms and are designed to give reasonable estimates of exposure limiting quantities. The reading of individual dosemeters are calibrated in terms of operational quantities. The international commissions involved in the definition of risk related quantities (ICRP) and operational quantities (ICRU) have introduced various new definitions and modifications to previous quantities used in their respective publications (ICRP 60 and ICRU 39, ICRU 47. The consequences of these alterations for the relationships between quantities within the hierarchy have to be examined and the new quantitative relationships (conversion coefficients) between basic physical radiation quantities such as particle fluence or air kerma and the new quantities have to be evaluated. In 1992, the ICRP and ICRU charged a joint task group with addressing these tasks with a view to revising ICRP Publication 51. This paper presents an outline for the subject of the report to be prepared by the task group. An introduction to the new phantom-based quantities is given and conceptional differences between the newly introduced and the previous quantities are discussed.


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