A comparative study of the dosimetric features of α-Al2O3: C, Mg and α-Al2O3: C

Kalita, Jitumani M; Chithambo, Makaiko L

Title: A comparative study of the dosimetric features of α-Al2O3: C, Mg and α-Al2O3: C
Creator: Kalita, Jitumani M
Creator: Chithambo, Makaiko L
Date Issued: 2017
Date: 2017
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/113058
Identifier: vital:33694
Identifier: https://doi.org/10.1093/rpd/ncx039
Description: A comparative study of the dosimetric features of α-Al2O3:C,Mg and α-Al2O3:C relevant to thermoluminescence dosimetry is reported. A glow curve of α-Al2O3:C,Mg measured at 1°C/s after beta irradiation to 1 Gy shows two subsidiary peaks at 42°C (labelled as I) and 72°C (II) and the main peak at 161°C (III) whereas a glow curve of α-Al2O3:C measured under the same conditions shows the main peak at 178°C (II′) and a lower intensity peak at 48°C (I′). Apart from these ones, there are several other peaks at temperatures beyond that of the main peak in both α-Al2O3:C,Mg and α-Al2O3:C. However, the latter are not included in this study. We report a comparative quantitative analysis of dose response and fading of peaks I, II and III of α-Al2O3:C,Mg and peaks I′ and II′ of α-Al2O3:C. Analysis shows that the dose response of peaks I and III is sublinear within 1–10 Gy whereas that of peak II is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy. In comparison, the dose response of peak I′ is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy whereas that of peak II′ is sublinear within 1–4 Gy followed by a superlinear region within 4–10 Gy. As regards to fading corresponding to 1 Gy, peak I is very unstable and fades within 300 s, peak II is more stable and takes up to 43200 s to fade. In comparison, peak III fades down to 30% of its initial intensity within 2400 s. Interestingly, between 2400 and 800 s, the intensity fades by 17% only. Regarding fading in α-Al2O3:C, peak I′ fades within 600 s whereas peak II′ shows an inverse fading behaviour up to 64800 s. The rate of fading for peaks I, II and III in α-Al2O3:C,Mg was found to decrease with increase in dose. However, no such behaviour was observed in α-Al2O3:C. The fading in both samples is discussed on the basis of a charge hopping mechanism.
Format: 11 pages
Format: pdf
Language: English
Relation: Radiation protection dosimetry
Relation: Kalita, J.M. and Chithambo, M.L., 2017. A comparative study of the dosimetric features of α-Al2O3: C, Mg and α-Al2O3: C. Radiation protection dosimetry, 177(3), pp.261-271.
Relation: Radiation protection dosimetry volume 177 number 3 261 271 December 2017 1742-3406
Rights: Authors
Rights: Use of this resource is governed by the terms and conditions of the Oxford Academic Journals Open Access Statement (https://academic.oup.com/journals/pages/open_access)

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