Choice of the measuring quantity for therapy-level dosemeters

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Abstract
With the introduction of SI [International System of Units] in radiology the quantity exposure will probably be replaced by therapy level dosimeters due to the inconvenient conversion factors required for the change into absorbed dose. Instead of exposure, a quantity is envisaged which, like absorbed dose, is measured in the unit gray (J/kg). Unfortunately, in the immediate future only primary standards of exposure will be available, necessitating the introduction of conversion factors at the interface between primary and secondary standards or field instruments. A full step toward calibration of field instruments in terms of absorbed dose in water under specified conditions is recommended rather than implementing a Kerma quantity as an immediate solution.

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