We employed two independent methods to study possible damage to the scintillation mechanism in lead tungstate crystals due to irradiation by a 34 V pion beam. Firstly 10 crystals were irradiated simultaneously over 30 h by a narrow beam, so that only a small region of each crystal was affected. We studied the effect of the irradiation on the light output non-uniformity. If a localized degradation was observed, it would indicate damage to the scintillation mechanism. Secondly, we detected light output using two phototubes attached to the sides of a crystal. Since these phototubes detect scintillation light only from a small localized region, the effect of transmission loss should be minimal. We did not see any statistically significant evidence for scintillation mechanism damage with either method. The effect is consistent with zero, and the upper limit is 0.5% at 95% C.L.
|Original language||English (US)|
|Number of pages||9|
|Journal||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|State||Published - Mar 11 2005|
Bibliographical noteFunding Information:
We thank the IHEP management for providing us infrastructure support and accelerator time and to Fermilab for providing equipment for data acquisition. Special thanks to Dr. R.Y. Zhu for his valuable suggestions. This work was partially supported by the US National Science Foundation and the Department of Energy as well as the Russian Foundation for Basic Research Grant 02-02-39008.
- Lead tungstate
- Radiation damage