PREPARATION AND CHARACTERIZATION OF RADIATION-HARD PBWO4 CRYSTAL SCINTILLATOR

Citation
Sc. Sabharwal et al., PREPARATION AND CHARACTERIZATION OF RADIATION-HARD PBWO4 CRYSTAL SCINTILLATOR, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 381(2-3), 1996, pp. 320-323
Citations number
13
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
ISSN journal
01689002
Volume
381
Issue
2-3
Year of publication
1996
Pages
320 - 323
Database
ISI
SICI code
0168-9002(1996)381:2-3<320:PACORP>2.0.ZU;2-X
Abstract
The selective loss of one of the crystal constituents is found to be r esponsible for the yellowish coloration of PbWO4 crystals. However, us ing the already pulled crystals as the starting charge for the subsequ ent growth, colorless crystals can be grown. The crystals exhibiting e xcellent transmission characteristics have been grown employing a low temperature gradient, a moderate rotation rate of 15 rpm and a pull sp eed of 1 mm/h. The colored crystals show some radiation damage on gamm a irradiation, while the colorless ones remain unaffected even for irr adiation doses as high as 10 Mrad. Both the types of crystals show the presence of weak thermoluminescence (TL) emission when high irradiati on doses (similar to 10 Mrad) are given. Only one TL glow peak is obta ined in both the cases but the peak temperatures are different. The em ission centers responsible for the TL emission are found to be the one s which give rise to the scintillation emission in the crystal.