Title of article :
Radiation damage measurements on CZT drift strip detectors
Author/Authors :
Kuvvetli، نويسنده , , I. and Budtz-Jّrgensen، نويسنده , , C. and Korsbech، نويسنده , , U. Bindslev-Jensen، نويسنده , , H.J.، نويسنده ,
Pages :
8
From page :
98
To page :
105
Abstract :
At DSRI, in collaboration with the cyclotron facility at Copenhagen University Hospital, we have performed a study of radiation effects exposing a 2.7 mm thick CZT drift strip detector to 30 MeV protons. The detector characteristics were evaluated after exposure to a number of fluences in the range from 2×108 to 60×108 p+/cm2. Even for the highest fluences, which had a dramatic effect on the spectroscopic performance, we were able to recover the detectors after an appropriate annealing procedure. The radiation damage was studied as a function of depth inside the detector material. A numerical model that emulates the physical processes of the charge transport in the CZT detector was used to derive the charge trapping parameter, μτe (the product of charge mobility and trapping time) as a function of fluence. The analysis showed that the electron trapping increased proportionately with the proton dose. The radiation contribution to the electron trapping was found to obey the following relation: (μτe−1)rad=(2.5±0.2)×10−7×Φ (V/cm)2 with the proton fluence, Φ in p+/cm2. The trapping depth dependence, however, did not agree well with the damage profile calculated using the standard Monte Carlo simulations, TRIM [1], for the proton-induced radiation effects. The present results suggest that proton-induced nuclear reactions contribute significantly to the radiation damage. Further work will elaborate on these effects.
Keywords :
Radiation damage , Proton irradiation , CdZnTe drift strip detectors , Electron trapping
Journal title :
Astroparticle Physics
Record number :
2021269
Link To Document :
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