Response characteristics of the TlBr radiation detector as a function of the detector temperature

The radiation detectors were fabricated from the TlBr crystals grown by TMZ method and the FWHM and transit time of electrons and holes were measured as a function of the detector temperature. The TlBr radiation detector shows the best response characteristics at about 320 K for holes. At the temperature of 330 K or above, the transit time and FWHM for the ²⁴¹Am α-particle peak become worse. On the other hand, in the case of electron, the spectrum becomes worse with increasing the temperature form 150 K to 380 K. In the case, we can deduce an activation energy of about 0.20 eV for holes and about 0.10 for electron from the temperature dependence of the carrier transit time