Measurement of conversion coefficients for calibrating individual dosemeters with respect to the operational dose quantities on the PMMA slab phantom

The backscatter and depth dose factors and the conversion coefficients between air kerma free-in-air and the dose equivalents in 7 mg.cm-2 and 1 g.cm-2 depths on the central axis of the PMMA slab phantom which is now preferred by the ICRU for calibrating individual dosemeters in terms of the operational dose quantities of ICRU report 39, were measured in parallel with ionisation chambers and TLD. The measurements were performed for three sets of differently filtered X rays with tube voltages between 15 and 400 kV, and for gamma radiation. The results obtained correspond well with those of comparable Monte Carlo calculations. (author)