DocumentCode :
756902
Title :
Transformations of Absorption and Emission Centers in 
Author :
Bohacek, Pavel ; Solovieva, Natalja ; Nikl, Martin
Author_Institution :
Inst. of Phys., Acad. of Sci. of the Czech Republic, Prague
Volume :
55
Issue :
3
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
1289
Lastpage :
1294
Abstract :
Non-stoichiometric PWO crystals were studied at annealing experiments in various atmospheres. It was found that a substantial part of absorption centers in the PWO platelets was brought into absorption activity due to mechanical processing of their surfaces. The green emission of the type G(II) is conditioned by presence of mechanical tension at the emission centers. A new process found at annealing is the transformation of the 330/355 centers into the 340/430 centers caused by separation of lead vacancies from the former ones.
Keywords :
V-centres; annealing; lead compounds; luminescence; solid scintillation detectors; vacancies (crystal); G(II) type; PbWO4; VO-centres; absorption transformations; annealing; green emission centers; lead vacancies; mechanical processing; mechanical tension; nonstoichiometric PWO crystals; radioluminescence spectra; scintillation detectors; Annealing; Atmosphere; Crystalline materials; Crystals; Electromagnetic wave absorption; Helium; Lead; Physics; Scintillation counters; Temperature; Absorption centers; emission centers; lead tungstate non-stoichiometric crystals; oxygen interstitials;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2007.914370
Filename :
4545077
Link To Document :
