Thermoluminescence dosimetry of rare earth doped calcium aluminate phosphors

Abstract

The thermoluminescence (TL) properties of calcium aluminate (CaAl 2 O 4) doped with different rare earth ions have been studied and their suitability for radiation dosimetry applications is discussed. It is observed that monocalcium aluminate doped with cerium is a good dosimeter having linear response up to about 4 kGy of radiation doses. Dopant concentration of 0⋅ ⋅25 mol% cerium gives maximum TL emission. The well-defined single peak observed at 295°°C can be advantageously used for high temperature dosimetry applications.

Elastico-mechanoluminescence and crystal-structure relationships in persistent luminescent materials and II–VI semiconductor phosphors

“…The crystal-structure of SrSi 2 O 2 N 2 is triclinic with space group P1 [20] and that of CaSi 2 O 2 N 2 is monoclinic with space group P2 1 [21] and thus both the crystals belong to a piezoelectric crystal classes. As SrSi 2 O 2 N 2 :Eu shows persistent luminescence upon excitation with UV light [13] and its crystal-structure is piezoelectric, the observed (weak) EML can be explained using the piezoelectrically-induced trap-depth reduction model of EML [56]. The CaSi 2 O 2 N 2 :Eu phosphor exhibits no EML because it hardly shows any persistent luminescence compared to BaSi 2 O 2 N 2 :Eu and SrSi 2 O 2 N 2 :Eu [19], but it should exhibit EML at low temperature.…”

Analysis of green luminescent Tb3+:Ca4GdO(BO3)3 powder phosphor

“…Their best-known applications are CTV screen phosphors, projection TV phosphors, fluorescent lamps, scintillators, full color displays, X-ray storage, dosimetry of ionizing radiation screen intensifying phosphors, laser materials, etc. [1][2][3][4][5][6][7][8][9][10]. In recent times, the host matrix Ca 4 GdO(BO 3 ) 3 has drawn a great deal of attention as a potential optical material based on its stable crystalline structure, versatility, and chemical stability [11][12][13][14][15][16].…”

Estudo morfológico do aluminato de cálcio dopado com cério sintetizado por método de combustão em solução

“…Estudos recentes têm investigado o comportamento de emissão dos íons Ce 3+ , onde a transição 4f -5d possui diferentes emissões eletromagnéticas do visível, pois dependem da intensidade do campo cristalino da matriz. Fósforos de longa permanência do Ce 3+ são relatados por Kodama (5) et al (2000) em Ca 2 Al 2 SiO 7 e CaYAl 3 O 7 , por Madhukumar (6) et al (2016). em matriz de CaAl 2 O 4 e por Chen (7) et al (2012).…”