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- W2089722799 abstract "The collection of charge in a silicon detector was studied for ionizing radiation of alpha and beta particles. In particular, the characteristics were studied for the case wherein the space-charge width of the detector is less than range of the ionizing particle. In this case there may be charge collection due to diffusion of electrons or holes to the edge of the space-charge region. The factors related to this type of collection are combined in a function termed the back-collection factor which is defined in an integral equation relating number of electron—hole pairs collected as a function of space-charge width. The back-collection factor is considered a function of distance from edge of space-charge region and amplifier-integration time. A method to calculate the back-collection factor as a series expansion is presented. Experimental data for 8.78- and 5.48-MeV alpha particles was analyzed to determine the range of back-collection and the form of its dependence on distance and integration time. The range of back-collection varies from 33 to 50 μ for integration time 0.1 to 5.0 μsec for 8.78-MeV alphas in silicon. Similarly, for 5.48-MeV alphas it varies from 16 to 52 μ. Beta particles required a different treatment because of their distribution of curved trajectories in a solid. The effect of this distribution in trajectories was considered in relation to the response of a silicon detector when space-charge width is less than range. It was noted that the previous experimental work by Agu et al. on absorption of electrons in aluminum foils of varying thickness should be in agreement with the count rate at full energy for a silicon detector when the albedo is included in the calculations. Experimental measurements were made on the number of electrons at full energy as a function of space-charge width for 264-keV conversion electrons from 203Hg and these were shown to be in agreement with Agu's data. The results support the view that solid-state detectors may be used to measure ionization effects within the solid from which they are constructed." @default.
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- W2089722799 date "1967-08-01" @default.
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- W2089722799 title "Charge Collection in Silicon Detectors Operated with Field Region Less than Range of Alpha or Beta Particles" @default.
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- W2089722799 doi "https://doi.org/10.1063/1.1710151" @default.
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