Measurements of F- and M-centre colour curves in NaCl during irradiation at temperatures between 15 and 95 degrees C and at dose rates of the order of 104 rad h-1 indicate quite clearly two distinct processes for M-centre production. One, the statistical process, leads to an M varies as F2 relation at both low and high doses. The other, an F-centre thermal diffusion process, produces a deviation in this relationship and furthermore is responsible for the maximum observed in F-centre colour curves at high temperatures. These two processes, together with an interstitial trapping model, provide a comprehensive picture for the first-stage colouring process in NaCl, over the range of temperatures and dose rates used here.
[1]
E. Hodgson,et al.
F-center stabilization process in the first coloring stage of alkali halide crystals
,
1978
.
[2]
A. Rascon,et al.
Thermoluminescence and colour centre thermal stability in KCl:Ca and KCl:Sr irradiated at room temperature
,
1978
.
[3]
W. D. Compton,et al.
F-AGGREGATE COLOR CENTERS IN KCl
,
1964
.
[4]
A. B. Lidiard,et al.
THE GROWTH OF COLLOIDAL CENTRES IN IRRADIATED ALKALI HALIDES
,
1976
.
[5]
W. Sibley,et al.
Radiation Equilibrium of F and M Centers in KCl
,
1963
.