Characterization of detector-systems based on CeBr3, LaBr3, SrI2 and CdZnTe for the use as dosemeters. (November 2017) - Kessler, P.
Abstract: For the upgrade of existing dosimetric early warning networks in Europe spectrometric detectors based on CeBr3, LaBr3, SrI2, and CdZnTe are investigated as possible substitutes for the current detector generation which is mainly based on gas filled detectors. The additional information on the nuclide vector which can be derived from the spectra of γ -radiation is highly useful for an appropriate response in case of a nuclear or radiological accident. The measured γ -spectra will be converted into ambient dose equivalent H * ( 10 ) using a method where the spectrum is subdivided into multiple energy bands. For each band the conversion coefficients from count rate to dose rate is determined. The derivation of these conversion coefficients is explained in this work. Both experimental and simulative approaches are investigated using quasi-mono-energetic γ -sources and synthetic spectra from Monte-Carlo simulations to determine the conversion coefficients for each detector type. Finally, precision of the obtained characterization is checked by irradiation of the detectors in different well-known photon fields with traceable dose rates. Abstract : Highlights: Spectro-dosimeters can replace existing dosimeters of early warning networks. They can be characterized experimentally and with Monte-Carlo simulations. Precision is similar or even better than that of a conventional dosemeter. Potential to serve as advanced dosimetric secondary standards in the future.