Poly-phosphoric acid etching of LSO crystals for improved light output, energy resolution and light transmission

Author

Siegel, S. ; Eriksson, M. ; Carey, A.A. ; Eriksson, L. ; Nutt, R.

Author_Institution

Concorde Microsystems, Knoxville, TN, USA

Volume

2

fYear

2000

fDate

2000

Abstract

Summary form only received as follows: The study was initiated to optimize the performance of a PET/SPECT detector based on a NaI(Tl)/LSO phoswich design. The PET/SPECT block consists of a 12*12 array of NaI(Tl) elements mounted on a 12*12 array of LSO elements, and a light guide. Each element is approximately 4*4*10 mm³. Poly-phosphoric etching of the LSO elements improves the light output and energy resolution of the LSO, as well as the transmission of the NaI(Tl) light through the LSO. After 15 to 20 minutes in 150°C acid, or 5 to 10 minutes in 200°C acid, the light output improved ~20%, energy resolution improved ~40% and light transmission improved ~28% for LSO with unpolished ends or ~12% for LSO with polished ends

Keywords

etching; gamma-ray detection; positron emission tomography; single photon emission computed tomography; solid scintillation detectors; 150 C; 200 C; 5 to 20 min; LSO crystals; NaI(Tl)/LSO phoswich design; NaI:Tl; PET/SPECT block; PET/SPECT detector performance optimization; energy resolution; improved light output; light guide; light transmission; medical diagnostic imaging; medical instrumentation; nuclear medicine; polished ends; poly-phosphoric acid etching; Crystals; Design optimization; Detectors; Energy resolution; Etching; Optical arrays; Positron emission tomography;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2000 IEEE

Conference_Location

Lyon

ISSN

1082-3654

Print_ISBN

0-7803-6503-8

Type

conf

DOI

10.1109/NSSMIC.2000.950027

Filename

950027