In this report is evaluated the response of the apatite powder ESR dosimeter irradiated with
60Co photons in the 0.2-100 Gy range. The specific material was developed in a previous systematic
study, which established the correlation between synthesis process, structural and dosimetric
properties ofthe A-type synthetic apatite. An excellent linear fit was obtained to the dose response in
the therapy leveI. Sources of the uncertainty intrinsic to the dosimeter and to the ESR technique was
evaluated showing the excellent precision leveI achievable with the apatite powder dosimeter.
Improvements can be performed to increase dosimeter accuracy.