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Proceedings Paper

Study of radiation-response properties of type IIa diamond detectors
Author(s): Nicolay B. Zaletaev
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Paper Abstract

Diamond has the highest radiation-damage level among radiation-detector semiconductor materials. Besides, low carbon nucleus charge, Z=6, provides tissue equivalence of diamond detectors. This made it possible to create unique natural diamond ionizing-radiation detectors possessing properties unachievable, for present time, for other materials. Perfection and new developments of diamond-based detectors encounter a number of obstacles, the main of which is related to empirical approach to the development in consequence of the lack of detailed understanding in physical mechanisms of such detector operation. This paper is an attempt to approach such understanding with the use of computer modeling of diamond detector operation and the comparison of this model with experimental results obtained for natural- and synthetic-diamond detectors. The model developed first makes it possible to explain main experimentally observed peculiarities of characteristics of natural diamond detectors exposed to hard X- and gamma rays, neutrons, alpha particles, and UV radiation. It is shown that for this purpose the model must be based on the charge carrier recombination process that ensures the variation of carrier lifetimes depending on the space charge value, in the whole detector volume. All calculations are conducted for two-level model of recombination which fits this requirement and, in particular, ensures experimentally observed lifetimes of charge carriers on the order of 10-8 s with the concentration of impurities of 1017 cm-3 real for natural diamond.

Paper Details

Date Published: 16 September 2005
PDF: 12 pages
Proc. SPIE 5922, Hard X-Ray and Gamma-Ray Detector Physics VII, 59220S (16 September 2005); doi: 10.1117/12.613120
Show Author Affiliations
Nicolay B. Zaletaev, ORION Research, Development, and Production Ctr. (Russia)

Published in SPIE Proceedings Vol. 5922:
Hard X-Ray and Gamma-Ray Detector Physics VII
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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