Abstract
Based on previously-reported results of the successful detection of alpha particles and 1 and 2 MeV protons with hydrogenated amorphous silicon (a-Si:H) diodes, detection of a single minimum-ionizing particle will require a total sensitive thickness of approximately 100–150 μm, either in the form of a single thick diode, or as a stack of several thinner diodes. Signal saturation at high dE dx makes it necessary to simulate minimum ionization in order to evaluate present detectors. Two techniques, using pulsed infrared light, and pulsed X-rays, give single-pulse signals large enough for direct measurements. A third, using beta rays, requires multiple-transit signal averaging to produce signals measurable above noise. Signal amplitudes from the a-Si: H limit at 60% of the signal size from Si crystals extrapolated to the same thickness. This is consistent with an a-Si: H radiation ionization energy, W = 6 eV/electron-hole pair. Beta-ray signals are observed at the expected amplitude.
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