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High resolution, low energy avalanche photodiode X-ray detectors

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4 Author(s)
R. Farrell ; Radiation Monitoring Devices Inc., Watertown, MA, USA ; K. Vanderpuye ; G. Entine ; M. R. Squillante

Silicon avalanche photodiodes have been fabricated, and their performance as X-ray detectors has been measured. Photon sensitivity and energy resolution were measured as a function of size and operating parameters. Noise thresholds as low as 212 eV were obtained at room temperature, and backscatter X-ray fluorescence data were obtained for aluminum and other light elements. It is concluded that the results with the X-ray detector are extremely encouraging, and the performance is challenging the best available proportional counters. While not at the performance level of either cryogenic silicon or HgI2, these devices operate at room temperature and can be reproduced in large numbers and with much larger areas than typically achieved with HgI2. In addition, they are rugged and appear to be indefinitely stable

Published in:

IEEE Transactions on Nuclear Science  (Volume:38 ,  Issue: 2 )