Energy dependence of different materials in ESR dosimetry for clinical X-ray 10 MV beam

The energy dependence of DL-alanine, 2-methylalanine, hydroxyapatite, calcite and sucrose in ESR dosimetry in terms of dose-to-water was investigated for clinical 10 MV X-rays using 60Co gamma ray as standard. Dose–response curves were obtained irradiating the dosimeters, which received doses from 1 to 20 Gy. The ESR spectra of the irradiated materials were obtained with a Varian E-4 X-band spectrometer, using microwave power in a non-saturation range and high modulation amplitude of the magnetic field in order to increase the dosimetric signal amplitude of the ESR spectra. The dose–response curves were a linear function and their slopes were used to study the energy dependence for the LINAC irradiation to the 60Co irradiation. The ratios of the slopes were: 0.96±0.050.96±0.05 for DL-alanine, 0.92±0.040.92±0.04 2-methylalanine, 0.96±0.030.96±0.03 sucrose, 1.07±0.281.07±0.28 hydroxyapatite, and 1.02±±0.12 calcite.