1995
DOI: 10.1088/0022-3727/28/6/032
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Effective co-dopants for CaSO4:Dy and CaSO4:Tm phosphors

Abstract: CaSO4:Dy and CaSO4:Tm are highly sensitive phosphors used in the thermoluminescence (TL) dosimetry of the ionizing radiations. It is shown that, by using P, Mo or SO3 as co-dopants, the TL sensitivities can be increased by 40-100%. The increase in sensitivity originates in various processes, which are discussed. P acts as a charge compensator, allowing the incorporation of Dy in higher concentration without causing quenching. Mo increases the efficiency of trap filling. It is claimed that use of Mo as a co-dop… Show more

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Cited by 34 publications
(32 citation statements)
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“…As mentioned in the previous sections the glow curve structure of the microcrystalline is the same as reported in the literature (Atone et al, 1995;Azorin and Gutierrez, 1989;Dorendrajit and Dwijen, 2004). It is one of the most studied system and hence much more literature is available on this phosphor, though still more work is going on to improve its properties and to understand the phenomena of TL and PL emission in more detail.…”
Section: Discussionsupporting
confidence: 63%
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“…As mentioned in the previous sections the glow curve structure of the microcrystalline is the same as reported in the literature (Atone et al, 1995;Azorin and Gutierrez, 1989;Dorendrajit and Dwijen, 2004). It is one of the most studied system and hence much more literature is available on this phosphor, though still more work is going on to improve its properties and to understand the phenomena of TL and PL emission in more detail.…”
Section: Discussionsupporting
confidence: 63%
“…A typical glow curve of the microcrystalline phosphor consists of one very prominent peak at around 494 K, which is known as a dosimetry peak along with two other peaks one on each side at around 406 and 594 K along with a small shoulder on high temperature side at around 673 K. This is not very much different than the glow curve structure reported in the literature (Atone et al, 1995;Azorin et al, 1984) while, the glow curve of the nanocrystalline material is very much different than that of the microcrystalline phosphor consisting of obvious peaks at around 411, 498, 569, and 652 K. To confirm, whether the glow curve consists of those peaks, they were separated by thermal cleaning method (Necmeddin and Yakup, 2001). It has been observed that there exists one more peak of lesser intensity at around 447 K (Fig.…”
Section: Thermoluminescence Glow Curvesmentioning
confidence: 67%
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“…There are equivalent changes ensuing from increases in dopant concentration and consequent pairing or precipitation of impurities in order to minimize the lattice distortions. Indeed a peak shift for CaSO 4 has also been reported with both dopant concentration and radiation dose [38,39]. Parallel experiments with rare earth ions in Bi 4 Ge 3 O 12 or LaF 3 similarly indicate clear links between the ionic sizes and temperature differences with the various RE glow peaks [40,41].…”
Section: Discussionmentioning
confidence: 67%
“…It is also served as detector materials since early 1970s [4]. Tm 3 þ doped CaSO 4 phosphor is very popular dosimetric material; however codopants such as Ag, Cu or others can be applied in order to modify its properties [5][6][7][8]. Moreover, thulium doped phosphors have received considerable attention over the past few years as Tm 3 þ ions potentially provide blue luminescence with potential applications in screens and displays [9,10].…”
Section: Introductionmentioning
confidence: 99%