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Radiation Protection Dosimetry 54:249-254 (1994)
© 1994 Oxford University Press

Experimental Determination of the Angular Dependence Factor for the Dose Equivalent for Photons in Calibration Phantoms of PMMA

E. Lund, F. Pernicka and C.A. Carlsson

The conversion coefficients from air kerma to dose equivalent at a depth of 10 mm in both a spherical and a slab phantom of PMMA have been determined for the X ray qualities: 40, 80 and 295 kV, ISO 'narrow' spectra and for 137Cs gamma rays. The angular dependence factors have been experimentally determined for the same qualities and for different angles between O o and 180 o. The absorbed doses have been measured with thermoluminescence LiF dosemeters. The conversion coefficients and the angular dependence factors are generally found to agree well with calculated ones. Some minor discrepancies are found for the angular dependence factors and the 30 x 30 x 15 cm3 PMMA slab phantom.


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