E. Papin et al., INFLUENCE OF THE CALCINING CONDITIONS ON THE THERMOLUMINESCENCE OF PURE AND DOPED ALPHA-ALUMINA POWDERS, Radiation protection dosimetry, 65(1-4), 1996, pp. 243-246
Citations number
5
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging","Nuclear Sciences & Tecnology
Pure alpha-Al2O3 powders have been prepared by thermal decomposition o
f ammonium alum (NH4Al(SO4)(2).12H(2)O). The calcinations were perform
ed at different temperatures, and under flowing oxygen or nitrogen or
hydrogenated argon. The thermoluminescence of these powders after X ra
y irradiation at room temperature is studied from room temperature to
780 K. Four peaks are found in almost all samples at 335, 420, 470 and
635 K. Only the intensities are variable. The last two peaks are spec
ifically interesting: the 470 K peak intensity is slightly higher for
a reducing atmosphere whereas the 635 K peak intensity increases signi
ficantly for an oxidising atmosphere. This high temperature peak could
be very convenient for dosimetry applications. Thermoluminescence aft
er X irradiation at low temperature (80 K) and thermostimulated exoele
ctronic emission results are also reported. Using the same procedure,
alumina powders doped with Mg2+, Cr3+ and Th4+ were also studied.