Scintillation Properties of Praseodymium Activated ${\rm Lu}_{3}{\rm Al}_{5}{\rm O} _{12}$ Single Crystals

Abstract

Scintillation properties of LuAG:Pr grown by Furukawa Co. Ltd., Japan, have been studied. The best crystals display light outputs up to 19000 ph/MeV and an energy resolution of 4.6% at 662 keV. The scintillation yield is found to be a function of size and temperature of the sample; it can be enhanced by 40% upon heating to 450 K. Radioluminescence spectra show both -and -transitions of Pr 3+ ions; the contribution of the latter increases with temperature. The scintillation decays are complex, with a fast decay constant of 20 ns. The presence of 176 Lu induces high background activity.

33000 photons per MeV from mixed (Lu_075Y_025)_3Al_5O_12:Pr scintillator crystals

“…The values of scintillation yield and energy resolution of all the studied crystals, derived from their spectra, are summarized in Table 2 On the way to explain our motivation to grow and investigate the (Lu x Y 1-x ) 3 Al 5 O 12 :Pr crystals and to get across the reported enhancement of yield in LuYAG:Pr compared to LuAG:Pr we remind that the precedent studies on the light output of LuAG:Pr used to indicate some room for improvement. In particular, it was noticed that at 450 K the yield of LuAG:Pr was higher by about 40% than at RT [9]. This feature, reflected by a characteristic Y = Y (T) curve presented in Fig.…”

“…The growth processes were performed in pure nitrogen atmospheres with a pulling rate of 1.0-1.5 mm/h, a rotation rate of 15-20 rpm, and a post-growth cooling time of at least 24 h. In this way optically high-quality single crystals with diameters up to 1 inch and about 2 inch long were obtained. The reference crystals of LuAG:Pr were grown by the Czochralski method at Furukawa Co. Ltd. as described in detail by Ogino et al [8] for the purposes of our previous studies [4,5,9]. The basic properties of the LuAG:Pr and LuYAG:Pr crystals used in the current research are listed in Table 1.…”

Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process

“…The properties of Pr 3+ ions incorporated in various crystalline matrices have been extensively investigated. LuAG and YAG garnet compounds and ceramics, as well as admixtures of Y and Ga into LuAG garnet crystals [14][15][16][17][18][19] have been characterized. Scintillation of Pr 3+ in aluminum perovskite compounds, such as YAP [20,21] and in silicates [22] have also been reported.…”

Coincidence resolution time of two small scintillators coupled to high quantum-efficiency photomultipliers in a PET-like system

“…1a) at the 511 keV photopeak from 22 Na show different average heights (V 511 keV = 5 V for LYSO, 2.6 V for LuAG) and decay times [4] (T 511 keV d = 40 ns for LYSO [5], 20 ns for LuAG [6]), but display comparable rise times (T 511 keV r = 4.4 ns for LYSO, 4.2 for LuAG), mostly dominated by PMT and electronics shaping. The ratio of the charge for the 511 keV signals to the single photoelectron charge Q 1pe , measured from SER, provides the photoelectron (pe) yield N pe = 4240±150 for LYSO [7] and N pe = 1727±182 for LuAG [8] crystals, respectively. The different N pe values are due to the different scintillator light yields and peak emission (310 nm for LuAG, and 420 nm for LYSO).…”