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. 2008;131(4):406-13.
doi: 10.1093/rpd/ncn197. Epub 2008 Jul 29.

Investigation of the ionisation density dependence of the glow curve characteristics of LIF:MG,TI (TLD-100)

Y S Horowitz  1 , A Horowitz, L Oster, S Marino, H Datz, M Margaliot
Affiliations

Investigation of the ionisation density dependence of the glow curve characteristics of LIF:MG,TI (TLD-100)

Y S Horowitz et al. Radiat Prot Dosimetry. 2008.

Abstract

The dependence of the shape of the glow curve of LiF:Mg,Ti (TLD-100) on ionisation density was investigated using irradiation with (90)Sr/(90)Y beta rays, 60 and 250 kVp X rays, various heavy-charged particles and 0.2 and 14 MeV neutrons. Special attention is focused on the properties of high-temperature thermoluminescence; specifically, the behaviour of the high-temperature ratio (HTR) of Peaks 7 and 8 as a function of batch and annealing protocol. The correlation of Peaks 7 and 8 with average linear-energy-transfer (LET) is also investigated. The HTR of Peak 7 is found to be independent of LET for values of LET approximately >30 keV microm(-1). The behaviour of the HTR of Peak 8 with LET is observed to be erratic, which suggests that applications using the HTR should separate the contributions of Peaks 7 and 8 using computerised glow curve deconvolution. The behaviour of the HTR following neutron irradiation is complex and not fully understood. The shape of composite Peak 5 is observed to be broader following high ionisation alpha particle irradiation, suggesting that the combined use of the HTR and the shape of Peak 5 could lead to improved ionisation density discrimination for particles of high LET.

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Figures

Figure 1.
Figure 1.
TL glow curve of LiF:Mg,Ti Batch CNS-4945 (ST-C annealing) following irradiation by beta rays at a dose level of 0.1 Gy.
Figure 2.
Figure 2.
TL glow curve of Batch CNS-4945 following 4.5 MeV proton irradiation with ST-C annealing at a fluence level of 109 cm−2.
Figure 3.
Figure 3.
TL glow curve of LiF:Mg,Ti Batch CNS-4945 (ST-C annealing) following irradiation by 7.5 MeV alpha particles at a fluence level of 109 cm−2. The HTTL is now very intense and is composed of at least four glow peaks. Peak 8 appears to have two components at ∼300°C and 330°C. Peak 5 is considerably broader presumably due to an enhanced intensity of Peak 5a.
Figure 4.
Figure 4.
TL glow curve of LiF:Mg,Ti following irradiation by 0.2 MeV neutrons at a dose level of 1 Gy. The dominant HTTL glow is now Peak 8.
Figure 5.
Figure 5.
HTR for Peak 7 as a function of LET for the various irradiation modalities. Dashed and full lines are intended only to guide the eye.
Figure 6.
Figure 6.
HTR for Peak 8 as a function of LET for the various irradiation modalities. Dashed and full lines are intended only to guide the eye.
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References

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