Determination of the energy response of closely tissue-equivalent diamond dosimeters for radiotherapy dosimetry

A monoenergetic X-ray syncrotron source was used to determine the energy response of a diamond detector in the range 5–25keV, clarifying the elemental composition of the detector. The response is shown to be influenced by the detector housing and electrical contacts. A model for the energy response of the detector is determined that is valid in the 5keV–15MeV with an accuracy of 5% and therefore can be used to correct the dosimeter response to low-energy and scattered radiation. ► Response of diamond detector to monoenergetic synchrotron X-rays measured. ► Data from response at atomic orbital edges extends model of energy response. ► Corrects field dependent response of the detector due to scattered photons.