Sensitive CaSO4:Dy and CaSO4:Tm Thermoluminescence Detectors Produced from Natural Crystals of Iran

Sohrabi, Mehdi; Jafarizadeh, M; Abbasisiar, F.

doi:10.1093/oxfordjournals.rpd.a032364

Cited by 4 publications

(1 citation statement)

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“…Due to all these good TLD properties, it feels always interesting to look for new codoping/ doping so that further TL sensitization in this outstanding phosphor could be brought about. The attempts to improve characteristics and to study thermoluminescence mechanisms of CaSO 4 : Dy are continued up to present day [1][2][3][4][5][6][7][8][9]. A very extensive comparative study is reported by Lakashmanan et.al concerning the features of newly designed CaSO 4 : Dy: crystal morphology, glow curve shape, emission spectra, dependence of sensitivity, detection threshold, storage stability, sensitivity to UV, and other features on activator concentration, grain size etc [10].…”

Section: Introductionmentioning

confidence: 99%

Mixed influence of copper and some f-block elements on thermoluminescence intensity of CaSO4: Dy, P phosphors

Wani¹,

Dhoble²,

Dhoble³

2014

Adv. Mater. Lett.

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Very little data on copper co-doped CaSO 4 : Dy and CaSO 4 : Dy, P phosphors seems to have been reported so far. In the present study the influence of copper and rare earths co-doping on thermoluminescence intensity of CaSO 4 : Dy, P phosphor has been investigated. Acid evaporation re-crystallization method was adopted for the synthesis purpose. Phosphors were characterized by scanning electron microscopy (SEM), photoluminescence (PL) and thermoluminescence (TL) techniques. Results obtained through this study are of mixed nature. In some cases TL intensity is either greater or nearly equal to standard CaSO 4 : Dy while in other cases it is half or rather weak in comparison to standard CaSO 4 : Dy phosphor. Copper was found to suppress temperature peak structure above 300 o C. SEM micrographs of CaSO 4 : P, Dy, Cu, RE phosphors show that the particle size is in the micrometer range, 1 to 5 µm approximately. The systematic study carried out in this work is solely novel as no such report existed before. From this study it is clear now that by co-doping multi-impurities simultaneously to enhance TL characteristics of CaSO 4 : Dy phosphor is no longer useful because it proved otherwise.

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