Thermoluminescence in CVD diamond films: application to radiation dosimetry

Citation
E. Vittone et al., Thermoluminescence in CVD diamond films: application to radiation dosimetry, DIAM RELAT, 8(7), 1999, pp. 1234-1239
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
DIAMOND AND RELATED MATERIALS
ISSN journal
0925-9635 → ACNP
Volume
8
Issue
7
Year of publication
1999
Pages
1234 - 1239
Database
ISI
SICI code
0925-9635(199907)8:7<1234:TICDFA>2.0.ZU;2-D
Abstract
In this work, we report the analysis of TL features of CVD diamond samples after exposure to Sr-90/(90)Yr beta particles. The glow curves have been analysed in order to determine the trapping kinet ics and the activation energies of the trapping levels. They have been inte rpreted as due to a first-order trap emptying process with activation energ ies ranging from 0.98 to 1.12 eV. Owing to the great practical interest of diamond in radiotherapy, we: have explored the application of CVD diamond as TL dosimeter. The dose-response of the CVD diamond film to beta irradiation was investigated at clinical ap plication doses and compared with the response of LiF TL100 samples. Moreover, measurements of charge pulses induced by 5.4 MeV alpha particles were carried out in order to investigate the effect of beta particle pre-ir radiation (or 'priming') on the charge collection efficiency. The saturatio n of hole trapping levels evaluated by glow curve analysis was shown to be strictly related to the improvement of charge collection efficiency. A mode l of the charge carrier dynamics is also presented which accounts for the o ptical bleaching of glow curve and alpha particle spectra. (C) 1999 Elsevie r Science S.A. All rights reserved.