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THERMOLUMINESCENCE IN ALKALINE-EARTH
DOPED KCl IRRADIATED AT ROOM
TEMPERATURE
A. Rascón, J. Alvarez Rivas
To cite this version:
C7- 1 58 JOURNAL DE PHYSIQUE Colloque C7, supplkment au no 12, Tome 37, Dtcembre 1976
THERMOLUMINESCENCE IN ALKALINE-EARTH
DOPED KC1 IRRADIATED
AT ROOM TEMPERATURE
A. R A S C ~ N and J. L. ALVAREZ RIVAS Junta de Energia Nuclear, Madrid-3, Spain
Abstract. -The thermoluminescence of KC1 : Ca, KC1 : Sr and KC1 : Ba single crystals gamma or X-irradiated at room temperature has been studied. Each impurity induces a different set of glow peaks. The pre-exponential factors and the activation energies of these peaks have been obtained. All of them obey first order kinetics. It has been found that the thermal annealing pro- cesses of the F and V (226 nm) centres have the same pre-exponential factors activation energies that the thermoluminescent processes. It is concluded, as in a previous work on pure Harshaw KC1 crystals, that the observed thermoluminescence is due to the recombination of mobile chlorine atoms, thermally released from traps, with F centres ; during this process an electron-hole recombination occurs and light is emitted. As in undoped KCl, with increasing vacancy centre (F, M...) concen- tration the glow peaks at low temperatures vanish while glow peaks at higher temperature appear. The light sum to the vacancy centre concentration in KC1 : Sr is two orders of magnitude higher than in KC1 : Ca, KC1 : Ba and undoped KC1 (Harshaw).
The experimental results also support that in the radiation induced F coloring processes, these impurities act as interstitial traps.
DISCUSSION A. E. HUGHES. - I have faith in your model in
pure crystals where the thermoluminescence is attri- buted to F-centre-interstitial recombination. However, I am not so certain in doped crystals, especially at low irradiation doses since all the work in LiF is interpreted in terms of electron and hole traps. Have you done any thermally-stimulated conductivity mea- surements with doped crystals to help distinguish between electron and atomic motion during thermo- luminescence runs ?
irradiation dose is considerably higher than those involved in dosimetry.
G. GUILLOT.
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Have you ever seen a change in the order of reaction as a function of F-centers or impurity concentration. Seretlo of South Africa has studied this in thermal annealing processes of F- and V-centers and he founds that the order is one if con- centration of F-centers is higher than concentration of impurities and two in the other case.5. L. ALVAREZ RIVAS.
