Optical and scintillation characteristics of Bridgman LuAP single crystals for positron emission tomography

Պետրոսյան, Ա. Գ.; Derdzyan, Marina; Lecoq, P.; Auffray, E.; Pédrini, C.; Dujardin, Christophe; Kuntner, Claudia; Sempere, P.; Ovanesyan, K. L.; Kamenskikh, I.A.

doi:10.1109/nssmic.2004.1466809

Cited by 2 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…%) crystals measured in 0.2 cm thick samples. The slope of the optical edge in LuAP:Ce is 7.68%/nm or close to the figures measured earlier in less concentrated crystals [6]. The slope for the two scandium containing crystals is smaller, 7.39%/nm and 7.15%/nm.…”

Section: A Crystals and Assessment Of Qualitysupporting

confidence: 88%

“…The single crystals for the present studies were grown using the vertical Bridgman technique and Mo containers under con-0018-9499/$26.00 © 2009 IEEE ditions specified in [6], [10] and optimized for boules measuring 1.8 cm in diameter and 10 cm long. Both pure and variously doped crystals (LuAP, LuAP:Ce, LuAP:Sc and LuAP:Ce,Sc) were prepared using , Al , and oxides of 99.99% purity.…”

Section: Methodsmentioning

confidence: 99%

“…The concentration of was measured using the method [6], [11] based on the shift of the on-set position of the optical edge with Ce concentration variation.…”

Section: Methodsmentioning

confidence: 99%

“…LuAP:Ce is however still in the research phase requiring improvement of the light yield and development of ways for economical production. Czochralski and Bridgman melt techniques have been so far applied to growth of LuAP:Ce; scintillation parameters of crystals grown by these two methods attained by 2004-2005 were reported in [2], [6], [7] (for earlier publications see the references cited therein).…”

Section: Comparison Of Spectral and Scintillationmentioning

confidence: 99%

See 3 more Smart Citations

Comparison of Spectral and Scintillation Properties of LuAP:Ce and LuAP:Ce,Sc Single Crystals

Պետրոսյան

Derdzyan

Ovanesyan

et al. 2009

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

Scintillation properties of LuAP:Ce and LuAP:Ce,Sc crystal series were studied under excitation by -rays from a 137 Cs source. Both series demonstrated comparable optical quality in terms of underlying absorption at 260 nm, slope of the optical edge and transmission in the range of emission. The light yield of LuAP:Ce crystals measured in 0 2 cm 0 2 cm 0 8 cm pixels increases linearly with the Ce concentration reaching at 0.58 at. % 6448 322 ph MeV and 9911 496 ph MeV in the long and in the short directions respectively (the light yield ratio is 65%) and shows no sign of light saturation. The energy resolution is found to depend, among other factors, on the uniformity of Ce concentration within the pixels and is improved to 7 1 0 4% ( = 0 2 cm), 9 5 0 5% ( = 0 8 cm). Intentional co-doping with Sc 3+ ions was tested and resulted in increase of the Ce distribution coefficient to about 0.3. This enabled to increase the concentration of Ce in LuAP:Ce,Sc crystals up to 0.7 at. %, while conserving high optical quality. In contrast to LuAP:Ce, the light yield in LuAP:Ce,Sc crystals does not increase with Ce concentration, the photo peak being gradually suppressed. The involved mechanisms are discussed basing on measurements of the unit cell volumes, Ce concentration uniformity, x-ray rocking spectra, absorption spectra of pure and variously doped LuAP crystals, and emission spectra under different excitations.

show abstract

Section: A Crystals and Assessment Of Qualitysupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

“…The concentration of was measured using the method [6], [11] based on the shift of the on-set position of the optical edge with Ce concentration variation.…”

Section: Methodsmentioning

confidence: 99%