Further studies on the new high sensitive CaSO4:Dy thermostimulated luminescence phosphor

A. R. Lakshmanan, A. Tomita, Y. S. Horowitz, L. Oster

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


CaSO4:Dy phosphor prepared by a new recipe (denoted as N) is nearly 50% more sensitive than the presently used one (denoted as P). N consists of needle shaped crystals while P is mostly quadrilateral. In P most of the grains in as-grown condition are >75 μm in size while in N most of the grains are <75 μm. While the sensitivity of P increases with grain size, an exactly opposite trend is seen with N since higher sized grains (>105 μm) in N are agglomerates of particles and hence are opaque. The detection threshold of N (14.4 μGy) is nearly 4 times lower than that of P (54.2 μGy). The major glow peak(s) in both the phosphors occur in the 460-490 K (187-217°C) region. But the low temperature peak near 390 K (117°C) is very prominent in P while its presence is insignificant in N. The post-irradiation storage stability of N at -30°C was tested up to a period of 25 d and found to be better than that of P. The emission spectra of P and N are characteristic of Dy3+:. In P, the 480 nm to 570 nm emission intensity ratio varies slightly with glow peak temperature, unlike that of N. The Dy concentration quenching effect in N is less serious than that in P. The intrinsic UV sensitivity of N is nearly a factor of 20 times lower than that of P.

Original languageEnglish
Pages (from-to)235-238
Number of pages4
JournalRadiation Protection Dosimetry
Issue number1-4
StatePublished - 1 Jan 2002
Externally publishedYes

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health


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