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Radiation Protection Dosimetry 85:71-74 (1999)
© 1999 Oxford University Press

Determining the Photon Air Kerma Backscatter Factor Profiles for the ISO and ICRU Recommended Slab Phantoms: Comparison Between LiF Measurements and Monte Carlo Calculations

G. Gualdrini, F. Monteventi and B. Morelli

Following the ICRU and ISO documents concerned with the calibration of photon personal dosemeters on slab phantoms, the ENEA Institute for Radiation Protection performed a series of studies aimed at adopting suitable routine procedures. The reference ISO and ICRU slab phantoms for calibrating dosemeters in terms of Hp (10,a) and Hp (0.07,a) have therefore been acquired. A slab phantom should in principle allow the simultaneous calibration of several dosemeters for the whole body. On the other hand, besides the inhomogeneity of the incident beam, it has to be taken into account that the phantom itself is responsible for a spatial dependence of the air kerma backscatter factor along its front face, implying a limitation of the practical calibration area. The results of Monte Carlo homogeneity area calculations are summarised, and validated using ionisation chamber independent mapping, and of a series of TL measurements of the same air kerma backscatter factor profiles are described.


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