Performance of Pellets and Composites of Natural Colourless Topaz as Radiation Dosemeters

Souza, Divanízia N.; Lima, José Fernandes de; Valério, Mário E.G.; Caldas, Linda V.E.

doi:10.1093/oxfordjournals.rpd.a005902

Cited by 28 publications

(13 citation statements)

References 3 publications

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“…The thermoluminescent (TL) properties of manufactured composites with a mixture of topaz-Teflon have been studied by our group since 2000, with the aim of developing a new solid-state dosemeter (1)(2)(3)(4) . In 2003 the first results of the TL response of topaz-glass composites prepared with a mixture of powdered topaz crystal and powdered commercial glass were presented (3) .…”

Section: Introductionmentioning

confidence: 99%

Use of composites of topaz–glass as TSEE and TL dosemeters

Magalhães¹,

Souza²,

Caldas³

2006

Radiation Protection Dosimetry

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The properties of the thermally stimulated exoelectron emission (TSEE) and thermoluminescent (TL) emission of topaz-glass composites were studied with the aim of using them as solid-state dosemeters. The TSEE response was studied as a function of radiation energy and as a function of absorbed dose. Topaz-glass composites presented a linear TL and TSEE response to dose within a range of 0.01-1 Gy. The topaz-glass composites presented higher TSEE peaks than topaz-Teflon pellets. In the dosimetry of radiotherapic fields normally the responses of the topaz-glass dosemeters are comparable to topaz-Teflon pellets. The results confirmed that these new dosemeters can be useful in monitoring the quality of the radiation sources. This dose mapping technique is particularly useful in investigating dose distribution throughout a planned target volume.

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Section: Introductionmentioning

confidence: 99%

Use of composites of topaz–glass as TSEE and TL dosemeters

Magalhães¹,

Souza²,

Caldas³

2006

Radiation Protection Dosimetry

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“…The saturation effect displayed by glow-peaks in many of the available TL dosimeters at high doses is however a serious limitanting factor against the acceptance of this technique in both high-dose measurements and accident dosimetry [4,6]. Recently commercial glasses [4,5], sand [6], topaz [7] and jade [8] have been studied using the thermoluminescent technique, and the results showed potential applications for high-dose dosimetry.…”

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confidence: 99%

“…Though dosimeters prepared with natural minerals like topaz or jade mixed with Teflon could be used at high-dose measurements they do not present linear TL behavior to doses higher than 1 kGy [7,8].…”

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confidence: 99%

Dosimetric characterization of wollastonite‐teflon composites

Souza

Melo

Oliveira

et al. 2007

Phys. Status Solidi (c)

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In this work, the thermoluminescent properties of pellets containing powdered Wollastonite embedded in Teflon were studied. The preliminary results using gamma rays from a 60 Co source showed linearity at the calibration curve between 0.5 Gy and 10 Gy. The main TL peaks are located at 125, 200 and 245 °C. The repeatibility of TL response presented a maximum coefficient of variation of 6.3%. The material can be used in successive irradiation-reading-annealing cycles without an appreciable change in its sensitivity. The calibration curve for a gamma source ( 60 Co) up to 20 kGy and the minimum detection limits were obtained. The results show that these Wollastonite-Teflon pellets present possibilities for use as TL dosimeters.

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“…Many materials as fluorides, borates, oxides, sulphates and silicates present thermoluminescent properties [1]. McLaughlin et al [2] described the main kinds of high-dose dosimeters, discussing their advantages and disadvantages; however, they need to combine characteristics that limit their use in the radiation dosimetry [3]. Additionally, most of the current detectors present high cost.…”

mentioning

confidence: 99%

Thermoluminescent characteristics of Actinolite‐Teflon composites for gamma high‐doses

Melo

Valério

Caldas

2007

Phys. Status Solidi (c)

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In this work a preliminary study of the thermoluminescent (TL) dosimetric properties of the Brazilian actinolite:Ca 2 (Mg,Fe) 5 (Si 8 O 22 )(OH) 2 (silicate of the Jade family) was undertaken for gamma high-doses. Actinolite occurs in several regions in the world. In this work actinolite in the form of rude mineral from Governador Valadares, Minas Gerais, Brazil, was studied. The natural actinolite samples were powdered, and the selected grains were mixed with Teflon in the proportion 2 (Teflon):1(Actinolite). The mixture was pressed and sintered for production of pellets of composites Actinolite -Teflon. The glow curves present two peaks at 125°C and 210°C. The TL response reproducibility presents a maximum variation coefficient of 4.8%. The calibration curve is linear between 0.5Gy and 1kGy for pellets irradiated with gamma radiation ( 60 Co) and between 0.5Gy and 10Gy for pellets irradiated with X-rays (33keV). The TL response presents an energy dependence of 26% for X-rays between 27 and 41keV. 1 Introduction The continuous use of ionizing radiations in processes associated to medical, industrial, agriculture and research applications has motivated the development of new thermoluminescent materials applied to high-dose dosimetry. Solid-state techniques based on thermoluminescence (TL) dosimetry are relatively inexpensive methods.Developments of silica-based materials suitable for thermoluminescence dosimetry (TLD) have been studied by several authors. Many materials as fluorides, borates, oxides, sulphates and silicates present thermoluminescent properties [1]. McLaughlin et al. [2] described the main kinds of high-dose dosimeters, discussing their advantages and disadvantages; however, they need to combine characteristics that limit their use in the radiation dosimetry [3]. Additionally, most of the current detectors present high cost. The silicates represent 92% of the whole percentage volume of the minerals of the earth crust [4], and therefore there is a wide field of studies of new materials for radiation dosimetry. The dosimetric properties of Jade were already studied using the thermoluminescent technique, showing its potential use for high-dose dosimetry [5].Recently, TL properties of manufactured composites with a mixture of Topaz-Teflon have been studied with the aim of developing a new solid-state dosimeter [6]. The objective of this work was to study the dosimetric properties of actinolite:Ca 2 (Mg,Fe) 5 (Si 8 O 22 )(OH) 2, a Brazilian silicate of the Jade family, for gamma high-doses.

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Performance of Pellets and Composites of Natural Colourless Topaz as Radiation Dosemeters

Cited by 28 publications

References 3 publications

Use of composites of topaz–glass as TSEE and TL dosemeters

Use of composites of topaz–glass as TSEE and TL dosemeters

Dosimetric characterization of wollastonite‐teflon composites

Thermoluminescent characteristics of Actinolite‐Teflon composites for gamma high‐doses

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