On the reproducibility of the glow curve of single crystal and commercial LiF

Heterogeneous interstitial nucleation was observed as a result of the expos ure to high dose rate and repeated irradiations of single crystals of LIF d oped with Mg and Ti. A comparison under the same conditions with the irradi ation of commercial LiF dosimeters was done. The temperature region for whi ch the observations were made applies to the region where V-K centers are m obile. Therefore, the recombination of some defects produced by gamma radia tion are primarily actual for the behavior around room temperature. Glow cu rves were obtained from irradiated LiF. The main disadvantages found are al most the same as those presented for commercial LiF. Also, in both cases we found differences in the thermoluminiscence response after storage was obs erved. The study was also focused to answering the question of how many tim es a dosimeter can be re-used after a severe irradiation. (C) 2000 Elsevier Science Ltd. All rights reserved.