Dp 567 en
Spectroscopic High Gamma Dose Rate Detector
Author: Hudec Marek
The master thesis studies a possibility of energy spectrum measurement at high dose rates (HD) of gamma radiation in the field of environmental radiation monitoring. Recent disasters and state of the art show lack of preparedness for emergency situations by means of spectrometers (i. e. the possibility of nuclide identification). This work presents a core development of a HD spectrometer for gamma-rays from 30 keV to 3 MeV by carefully selecting the detector's material, size and considering its suitability for long-term monitoring in a temperature range from -40 °C to 60 °C. The small cadmium zinc telluride (CdZnTe) and cerium bromide (CeBr3) detectors selected based on Monte-Carlo simulations in Geant4 yield satisfactory results in terms of their spectrum shape (e. g. Peak-To-Compton ratio), achieved HD limit and temperature stability. The exploited limitations of the detectors, including the electronics and the 16 MHz MCA used, are further analyzed and show a possibility of improvement and achievement of even higher dose rates (>250 mSv/h).
- Marek Hudec, mailto:hudecma7@fel.cvut.cz
