Role of TL thermal quenching in CVD diamond for medical applications

The thermoluminescence response in CVD diamond, related to the absorbed dose, depends on many parameters. This work points out the role of heating rate.Experiments were achieved after both UV excitations and X-ray irradiations on MWCVD diamond. The increase of heating rate results in a large shift in temperature maximum of the dosimetric peak and important thermoluminescence decrease is highlighted. Theory of Mott–Seitz was applied and good agreement was shown with experimental glow curves. The key parameter of this model, which is the thermal activation energy of non-radiative transitions W, is estimated around 0.49 eV. Trapping parameters relative to the dosimetric peak were determined using “initial rise method”. Taken into account corrections due to the thermal quenching a new set of parameters was then obtained. Important corrections of trapping parameters are observed.