Mechanism of radiothermoluminescence of crystalline tetracosane

Aulov, V. A.; Кучкина, И. О.; Ozerin, А. N.

doi:10.1134/s0018143912010043

High Energy Chem

2011

DOI: 10.1134/s0018143912010043

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Mechanism of radiothermoluminescence of crystalline tetracosane

V. A. Aulov

И. О. Кучкина

А. N. Ozerin

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“…In the earlier studies [1,2] on the radiothermolu minescence (RTL) of tetracosane (TC), it was found that n tetracosane in the temperature range of 100-300 K has an RTL curve due to charge carriers trapped in intracrystalline regions. The RTL intensity decreases over the entire temperature range of 100 to 300 K when an electron scavenger (CCl 4 ) is introduced into the sample.…”

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Radiothermoluminescence of surface layers of n-tetracosane crystals

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In the earlier studies [1, 2] on the radiothermolu minescence (RTL) of tetracosane (TC), it was found that n tetracosane in the temperature range of 100-300 K has an RTL curve due to charge carriers trapped in intracrystalline regions. The RTL intensity decreases over the entire temperature range of 100 to 300 K when an electron scavenger (CCl 4 ) is introduced into the sample. Normal TC is a fully crystalline alkane [3], and CCl 4 molecules can be accommodated only in intercrystalline regions or on the crystal sur face. Therefore, the obtained result suggests that a portion of electrons in irradiated TC is trapped on the crystal surface. It was found that the proportion of these charges increases with an increase in the radia tion dose [4] to reach 30-35% at a dose above 5 kGy. This finding is of importance and interest to us. In this paper, we report the results of a detailed investigation of this feature of charge trapping in the irradiated alkane.EXPERIMENTAL Reagent grade tetracosane (mp 50°С) was used without additional purification. Tetracosane crystals of approximately 20 mg mass were melted in an alumi num holder (10 mm diameter) on a heating stage and cooled in air at room temperature. A part of the sam ples were evacuated for 100 min and cooled in liquid nitrogen together with an evacuated ampoule. The other part after evacuation was exposed to unsaturated CCl 4 vapor (pressure about 40 torr) at room tempera ture and cooled by pouring liquid nitrogen into the ampoule. The liquid CCl 4 was at 0°C during sorption. Irradiation was conducted on a 60 Co γ source at a dose rate of 10 kGy/h. Warming of the irradiated samples was performed at a rate of 10 to 11 K/min. Figure 1 presents RTL curves for evacuated TC (1), its sample with the scavenger (2), and their difference (3) . It is seen that the entire RTL differential curve (3) is close in shape to RTL curves 2 and 3. The major intensive peaks of the RTL curve (3) are approxi mately at the same temperatures as in RTL curves 1 and 2. Nevertheless, a more thorough analysis of curve Abstract-A radiothermoluminescence (RTL) curve of surface layers of n tetracosane crystals has been obtained, which appear to be similar but not identical to the RTL of the evacuated sample or the sample with CCl 4 . Since CCl 4 does not penetrate the crystal, the difference between the RTL curves of the evacuated sam ple and the one with CCl 4 represents the RTL of crystal surface layers. The RTL curve of tetracosane with the scavenger is that of RTL of intracrystalline areas of the alkane. The difference in shape between the sur face and bulk RTL curves is manifested well in the ratio of the RTL curves for the surface and the evacuated sample. RESULTS AND DISCUSSION

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Radiothermoluminescence of surface layers of n-tetracosane crystals

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Dose dependence of the radiothermoluminescence intensity of polyethylene crystalline regions

2012

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Changes in the radiothermoluminescence curve of crystalline regions of polyethylene during storage of its irradiated samples in liquid nitrogen

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Mechanism of radiothermoluminescence of crystalline tetracosane

Cited by 6 publications

References 3 publications

Radiothermoluminescence of surface layers of n-tetracosane crystals

Radiothermoluminescence of surface layers of n-tetracosane crystals

Dose dependence of the radiothermoluminescence intensity of polyethylene crystalline regions

Changes in the radiothermoluminescence curve of crystalline regions of polyethylene during storage of its irradiated samples in liquid nitrogen

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