Dosimetric characteristics of high sensitive Mg2SiO4:Tb solid TL detector

doi:10.1016/j.radmeas.2007.11.025

Radiation Measurements

Volume 43, Issues 2–6, February–June 2008, Pages 463-466

https://doi.org/10.1016/j.radmeas.2007.11.025 Get rights and content

Abstract

Thermoluminescence dosimetric characteristics of ${Mg}_{2} {SiO}_{4} : Tb$ in form of sintered pellets developed at the Institute of Nuclear Sciences, Vinc`a, Belgrade, are presented. ${Mg}_{2} {SiO}_{4} : Tb$ is a TL material with attractive features for dosimetric applications such as ultra high TL sensitivity, simple glow curve with the main TL peak at about 210 °C and low fading. The dosimetric properties of this TL detector examined in this study include glow curve shape, TL sensitivity, annealing procedure and reproducibility, photon dose response, minimum detectable dose, energy response, fading characteristics, light induced effect and optically stimulated luminescence (OSC) signal.

Introduction

Terbium activated magnesium orthosilicate, ${Mg}_{2} {SiO}_{4} : Tb$ , is an attractive thermoluminescent material because of very high TL sensitivity to photon radiation, and chemical stability. The first TL material based on magnesium orthosilicate was introduced in radiation dosimetry in 1971 (Hashizume et al., 1971, Toryu et al., 1973). However, the characteristics of this phosphor essentially depend on the production techniques used, i.e. on the temperature and duration of sintering process for preparation of polycrystalline TL material, on the starting chemicals used, etc. The present paper describes the preparation and the dosimetric characteristics of this TL phosphor which was obtained by a completely different preparation method than existing methods (Hashizume et al., 1971, Toryu et al., 1973, Bhasin et al., 1976.). As a result of the comprehensive work at the Institute Vinca, an optimal method of preparation ${Mg}_{2} {SiO}_{4} : Tb$ TL material was developed, resulting in a material in which the main TL peak of this material is found to be at about 210 °C, without low temperature peak, and with very small intensities of high temperature peaks. Besides, this material is one of the most sensitive thermoluminescence phosphor prepared so far.

The dosimetric characteristics of developed ${Mg}_{2} {SiO}_{4} : Tb$ solid TL dosemeters examined in this study include glow curve shape, TL sensitivity, annealing procedure and reproducibility, photon dose response, minimum detectable dose, relative photon energy response, fading, light induced effect and optically stimulated luminescence (OSL) signal.

Section snippets

Materials and methods

Terbium is known to be one of the most efficient activators, even in a very small concentrations, with a complex optical emission spectrum with main peaks arround 380 and 552 nm. ${Mg}_{2} {SiO}_{4} : Tb$ is a relatively complex TL material whose glow curve shapes and TL intensities are strongly influenced by the preparation method, on the phases of the $MgO - {SiO}_{2}$ system present, on the activator concentration and the chemical form of the basical chemical used, the sintering temperature, and on the temperature

Glow curve

Depending on the preparation procedure the glow curve shape differs significantly in such way that ${Mg}_{2} {SiO}_{4} : Tb$ prepared by Toryu et al. (1973) shows TL peaks at about 95, 190 (the main TL peak) and at 285 °C, while the material prepared by Bhasin et al. (1976) shows the TL peaks at 50, 90, 170, 300 and 420 °C, with the main TL peak at 300 °C.

The ${Mg}_{2} {SiO}_{4} : Tb$ TL material developed and presented in this paper shows one prominent TL peak at 210 °C without low temperature peak and two very low intensity

Conclusion

${Mg}_{2} {SiO}_{4} : Tb$ solid sintered TL detectors developed and produced at the Institute of Nuclear Sciences, Vinca, Belgrade, presents one of the most sensitive thermoluminescence phosphor prepared so far. ${Mg}_{2} {SiO}_{4} : Tb$ is a TL material with attractive features for dosimetric applications such as ultra high TL sensitivity, simple glow curve, chemical stability and low fading. It enables the construction of TLD cards which are compatible with the standard automatic TLD readers for potential applications in

References (8)

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Solid State Dosimetry
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Preparation and thermoluminescent characteristics of terbium doped magnesium orthosilicate phosphor
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Hashizume, T., Kato, Y., Nakajima, T., Sakamoto, H., Kotera, N., Eguchi, S., 1971. A new thermoluminescence dosemeter...
K. Kato et al.
Calibration of ${Mg}_{2} {SiO}_{4} : Tb$ thermoluminescent dosemeters for use in determining diagnostic X-ray doses to adult health study participants
Med. Phys.
(1991)

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Dosimetric characteristics of high sensitive Mg2SiO4:Tb solid TL detector

Abstract

Introduction

Section snippets

Materials and methods

Glow curve

Conclusion

Solid State Dosimetry

Preparation and thermoluminescent characteristics of terbium doped magnesium orthosilicate phosphor

Health Phys.

Calibration of Mg2SiO4:Tb thermoluminescent dosemeters for use in determining diagnostic X-ray doses to adult health study participants

Med. Phys.

Dosimetric characteristics of high sensitive ${Mg}_{2} {SiO}_{4}$ :Tb solid TL detector

Calibration of ${Mg}_{2} {SiO}_{4} : Tb$ thermoluminescent dosemeters for use in determining diagnostic X-ray doses to adult health study participants