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Radiation Protection Dosimetry 28:69-72 (1989)
© 1989 Oxford University Press

Calibration of Personal Dosemeters for X and Gamma Radiation in Front of Different Phantoms

H.-J. Selbach, K. Hohlfeld and H.M. Kramer

If the directional dose equivalent H'(10) is to become the quantity for calibrating personal dosemeters, some questions as yet still open need to be answered, i.e. the choice of a phantom for the practical calibration procedure together with a suitable set of correction factors. The dose equivalent on the surface of the ICRU sphere can be derived from the dose equivalent on the surface of a phantom different in shape and/or material by applying a phantom-specific and energy-dependent correction factor. However, this has proved unsatisfactory for the calibration of dosemeters which respond differently to the scattered radiation from the phantom. Phantom-specific correction factors are presented and compared with the response of selected types of dosemeters exposed on the surface of different phantoms. The different response of dosemeters to scattered radiation is also of interest to the question of the extent to which the reading of a personal dosemeter worn on the trunk will change if it is calibrated on the surface of a phantom in terms of the directional dose equivalent, H'(10), instead of being calibrated in free air in terms of exposure or kerma.


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