Performance of Large Area Avalanche Photodiode for a Low Energy X-Rays and gamma-rays Scintillation Detection
- SLAC
The authors report on the performance of large-area (5 x 5 mm{sup 2}) avalanche photodiodes (APD) produced by Hamamatsu Photonics, as a low energy X-rays and {gamma}-ray scintillation detector. Hamamatsu APD has a reverse structure and works at relatively low bias voltage of 300-350 V. The leakage current is 1.2 nA at room temperature (25 C) and decreases to 10 pA at -20 C for an avalanche gain of 50. The best FWHM energy resolutions of 9.4 {+-} 0.3% and 7.4 {+-} 0.3% were obtained for 59.6 keV {gamma}-rays from {sup 241}Am and 122 keV {gamma}-rays from{sup 57}Co sources, respectively, as measured with a 5mm{sup 3} cubic CsI(Tl) crystal. They show that the minimum detectable energy for the scintillation light is remarkably low; 4.6 keV at room temperature (20 C) and 1.1 keV at -20 C. 5.9 keV X-rays from {sup 55}Fe were clearly resolved at -20 C with a FWHM resolution of 32.9 {+-} 0.3%. These results suggest that Hamamatsu APD can be a promising device for future applications in low-energy scintillation detection.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 826645
- Report Number(s):
- SLAC-PUB-10311
- Country of Publication:
- United States
- Language:
- English
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