Abstract
The thermally stimulated luminescence and IR absorption spectra of MgO:Mn2+ crystals irradiated in different reactors have been studied. It has been shown that dependence of TSL peaks (450 and 550 K) and optical absorption bands (3290, 3720 and 1600 cm-1) on neutron fluence correlate. The trend of these changes in the same fluence range (1014-1017 n/cm2) depends both on the initial state of the crystal and on the irradiation source, which may be explained by the “small dose effect”.
Highlights
In nominally pure (n.p.) single crystals of magnesium oxide steady increase of the thermally stimulated luminescence (TSL) peak intensity with growth of the reactor irradiation fluence has been generally observed [1,2]
At first the crystal was irradiated in the IBR reactor, registration of TSL peaks following, i.e. short-term heating up to approximately 800 K with subsequent cooling, the crystal was again irradiated this time in the WWR-SM reactor
Dependences 1 and 2 (Figure 4), corresponding to TSL peaks at 450 K and 550 K after final irradiation, show the reverse trend of the peaks behavior, whereas in the previous cases (Figure 2 and 3) the same trend is observed for the similar dependences
Summary
In nominally pure (n.p.) single crystals of magnesium oxide steady increase of the thermally stimulated luminescence (TSL) peak intensity with growth of the reactor irradiation fluence has been generally observed [1,2]. After irradiation of MgO:Mn2+ crystals by fast neutrons (4.5 MeV) in a fluence interval of 109 - 1011 n/cm monotonic decrease of TSL intensity is observed [3], while at higher fluencies (>1013 n/cm2) for the same crystals TSL increase takes place [2]. Analysis of the abovementioned results [1,2,3] makes it possible to suppose that differing behavior of TSL peaks is caused not by the difference in the ranges of neutron fluence, but is due to the differences in the irradiation sources and initial state of the crystals.
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