Title :
X-ray and charged particle detection with CsI(Tl) layer coupled to a Si:H photodiode layers
Author :
Fujieda, I. ; Cho, G. ; Drewery, J. ; Gee, T. ; Jing, T. ; Kaplan, S.N. ; Perez-Mendez, V. ; Wildermuth, D. ; Street, R.A.
Author_Institution :
Lawrence Berkeley Lab., CA, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
A compact real-time X-ray and charged-particle imager with digitized position output can be built either by coupling a fast scintillator to a photodiode array or by forming one on a photodiode array directly. CsI(Tl) layers 100-1000-μm thick were evaporated on glass substrates from a crystal CsI(Tl). When coupled to a crystalline Si or amorphous silicon (a-Si:H) photodiode and exposed to calibrated X-ray pulses, their light yields and speed were found to be comparable to those of a crystal CsI(Tl). Single β particle detection was demonstrated with this combination. The light spread inside evaporated CsI(Tl) was suppressed by its columnar structure. Scintillation detection gives much larger signals than direct X-ray detection due to the increased energy deposition in the detector material. Fabrication of monolithic-type X-ray sensors consisting of CsI+a-Si:H photodiodes is discussed
Keywords :
X-ray detection and measurement; beta-ray detection and measurement; nuclear electronics; photodiodes; scintillation counters; semiconductor counters; β particle detection; CsI(Tl) layer; CsI:Tl; Si:H; X-ray; a Si:H photodiode layers; charged particle detection; charged-particle imager; columnar structure; compact real-time; detector material; digitized position output; energy deposition; fast scintillator; glass substrates; light spread; light yields; monolithic-type; photodiode array; Amorphous silicon; Crystalline materials; Crystallization; Glass; Optical coupling; Photodiodes; Solid scintillation detectors; X-ray detection; X-ray detectors; X-ray imaging;
Journal_Title :
Nuclear Science, IEEE Transactions on
