IHEP 97 - 13
G.I.Britvich et al.
Luminescent Properties of Frozen Scintillators
Protvino, 1997.- p.10, figs. 11, tables 3, refs.:10.

Temperature dependencies of the light outputs of liquid and frozen scintillators have been investigated. Frozen in vacuum to a temperature of about -120$^o$C green emitting light scintillators based on 1-methylnaphthalene solvent enhanced their light outputs up to 2.2-3.3 times relative to the levels in their liquid states at room temperature in air. For scintillators frozen in vacuum their light outputs reached levels of 92-144% in comparison with an anthracene under high energy $\beta$-particles excitation. In the processes of cooling down to a temperature of about -120$^o$C and then heating up to 20$^o$C all the tested scintillators in some temperature intervals revealed the effects of thermal hysteresis of their light outputs. Signals duration of frozen scintillators in air increased in comparison with those at room temperature. The light outputs of these tested scintillators are sensitive to the density of ionization.

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