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OPTICALLY INDUCED F CENTRE-INTERSTITIAL
RECOMBINATION IN GAMMA IRRADIATED KCl
V. Ausín, J. Alvarez Rivas
To cite this version:
JOURNAL DE PHYSIQUE Colloque C7, supplkment au no 12, Tome 37, Dkcembre 1976, page C7-159
OPTlCALLY INDUCED
F
CENTRE-INTERSTITIAL RECOMBINATION
IN GANIMA IRRADIATED
KC1
V. AUSIN and J. L. ALVAREZ RIVAS
Junta de Energia Nuclear, Madrid-3, Spain
Abstract.
-
It is known that when gamma irradiated KC1 crystals are illuminated with F light they show a luminescence with its maximum at about 440 nm. The same emission band appears in the thermoluminescence of these samples from LNT to 300 OC. Several KC1 samples were gamma irradiated at room temperature. Afterwards they were heated at 100 OC till no light at 440 nm was observed. They were then cooled down to room temperature. Each sample was illuminated with F light during some interval of time, a different interval for each sample. While this was made, the variation of the F centre concentration and the light intensity were simultaneously measured. After this bleaching interval, the thermoluminescence of the sample up to 350 OC was obtained. It was found that the area ( A F ) under the photoluminescence curve and the area ( A T ) under the thermo- luminescence curve verify AF/.B f A ~ i a = Fo f 2 Mo. It has been concluded that this photo- luminescence is due to the recombination of F centres which are mobile under illumination with trapped interstitials.This light emission at 440 nm has been used to detect optically induced F centre migration in several experiments. The results support Liity's proposal that the F* center is the mobile entity.
DISCUSSION M. C. WINTERSGILL. - Dr. Chen has shown
that even for a simple, single trap-single recombina- tion centre system at least nine parameters must be separately determined if true values for quantities such as the pre-exponential frequency factor can be determined. Unless these parameters are properly determined, little significance can be attached to cal- culations of the pre-exponential factor and u'se of only one or two techniques, the isothermal annealing
of curve fitting, leads to a large range of values for example up t o lo2' for peak 5 of an LiF glow curve, instead of more conventional values of the order of 108-1010.
J. L. ALVAREZ RIVAS.
