Speaker
Description
Diamond detectors have been studied since long, its radiation hardness makes it appealing for beam monitoring application and its tissue equivalence makes it attractive for radiotherapy or dosimetry. Its low leakage current allows to operate diamond detectors without doping.
Single crystal diamond is vastly used, but to approach a most cost effective material, here a polycrystalline diamond is studied. The polycrystalline diamond presents trap centres in the grain boundaries that diminish the charge collection distance. Besides, polarization effects emerge during time changing the electric field and showing a decrease in the charge collection distance. Pumping the diamond, exposing it to radioactive sources without bias voltage, create electron holes pairs inside the diamond that then fill some trap centres and increase the charge collection distance.
For this presentation, results of the pumping and unpumping mechanisms for a polycrystalline diamond detector are presented. In depth studies will be shown for the trapping centres inside the diamond.