DocumentCode :
2545034
Title :
A study on radiation hardness of BGO crystals
Author :
Liyuan Zhang ; Rihua Mao ; Shaohua Wang ; Fan Yang ; Ren-yuan Zhu
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
fYear :
2012
fDate :
Oct. 27 2012-Nov. 3 2012
Firstpage :
361
Lastpage :
364
Abstract :
We report an investigation on the radiation hardness of 20 cm long BGO crystals produced at Shanghai Institute of Ceramics. Their optical and scintillation properties, such as transmittance and emission spectra, light output and response uniformity, were measured before, during and after γ-ray irradiations at 2, 8, 30 and 5,444 rad/h. BGO crystals produced in 2004 and 2011 are compared to a sample grown in early eighties for the L3 experiment at LEP. Significantly better radiation harness is observed in the sample grown in 2011 in transmittance, light output and radiation hardness. Their use for crystal calorimeters in future high energy physics experiments is discussed. To maintain crystal resolution, a precision light monitoring system is mandatory to trace variations of crystal transparency in situ for a BGO crystal calorimeter in a radiation environment. The origin of radiation damage in BGO is also discussed.
Keywords :
bismuth compounds; gamma-ray effects; hardness; scintillation; γ-ray irradiation; BGO crystals; Bi4Ge3O12; crystal calorimeters; crystal resolution; emission spectra; optical properties; radiation damage; radiation hardness; scintillation properties; transmittance spectra;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE
Conference_Location :
Anaheim, CA
ISSN :
1082-3654
Print_ISBN :
978-1-4673-2028-3
Type :
conf
DOI :
10.1109/NSSMIC.2012.6551126
Filename :
6551126
Link To Document :
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