A study was made of thermoluminescence emissions from material that was doped with Al3+ or La3+ to nominal concentrations of between 0.01 and 1mol%. It was found that samples which were doped with Al3+ exhibited the best sensitivity to -rays, whereas the pure material exhibited the best sensitivity to ultra-violet and visible light. The thermoluminescence signals from Al3+-doped samples attained a maximum intensity at a nominal concentration of 0.2mol%. In the case of La3+-doped samples, the thermoluminescence emission increased with the dopant concentration. A 3-dimensional thermoluminescence plot revealed that an emission at 480nm, which was observed in all of the samples, might be due to a luminescent center of intrinsic origin. An emission at 570nm in Al3+-doped samples was attributed to a transition of the Al3+ ion.

A.P.De Melo, J.F.De Lima, A.M.G.Figueredo, A.V.Chadwick, M.E.G.Valerio: Materials Science Forum, 1997, 239-241, 749-52