Supplementary values of the dosimetric parameters kNR and Em for various types of detectors in 6 and 15 MV photon fields.

The present communication broadens the data base for determinations of the non-reference condition correction factor kNR needed in high-energy photon dosimetry to accomplish the use of various detectors under non-reference conditions. Following our previous strategy of calculating semiempirical values of kNR and correlating them with the mean photon energy Em at the point of measurement in a large water phantom, the values of Em are now stated for 6 and 15 MV photon radiations of accelerators with and without flattening filters, square field sizes from 1 to 30 cm side length and depths from 0 to 28 cm. The unambiguity of the kNR-Em correlation is again confirmed and is quantified by fitting formulae for air-filled ionization chambers, TLD detectors and Si diodes. This survey provides a practicable access to the kNR values, particularly for the non-water equivalent detectors to be used in small-field dosimetry.