A study on the radiation hardness of lead tungstate crystals
This report presents recent progress of a study on the radiation damage in lead tungstate (PbWO_4) crystals. The dose rate dependence of radiation damage in PbWO_4 has been observed. An optimization of the oxygen compensation through post-growth thermal annealing has led to PbWO_4 samples with significantly improved radiation hardness. Front irradiation is found to cause a factor of 2 to 6 times less severe damage than uniform irradiation. Lanthanum doping was found not to be a determining factor for PbWO_4 radiation hardness improvement. Finally, a TEM/EDS analysis revealed that the radiation damage in PbWO_4 crystals is caused by oxygen vacancies.
Additional Information© 1998 IEEE. Work at Caltech supported in part by U.S. Department of Energy Grant No. DE-FG03-92-ER40701, and at BNL in part by US. Department of Energy Contract No. DE-AC02-CH7600016. We thank Prof. Z.W. 'fin of SIC and Dr. G. Cheng of BGFU for providing PbWO_4 samples described in this report. Many inspiring and interesting discussions with Drs. M. Kobayashi, J.Y. Liao, G.Q. Wu anld Z.W. Yin are also acknowledged. Drs. E Nessi and P. Lecomte cross checked the light output measurement described in Section II.
Published - 00682613.pdf