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Paper 99-5
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A simulation of a CdTe gamma ray detector based on collection efficiency profiles as determined by lateral IBIC
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Presented at the "Workshop on Room Temperature Semiconductor Detectors for remote, portable and in situ radiation measurements systems", Jerusalem, Israel, July 27-28, 1998, and published in Nucl. Instr. And Meth. In Phys. Res. A, 426, (1999), 185-191 |
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E.Vittone, F.Fizzotti, A.Lo Giudice, P.Polesello and C.Manfredotti |
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Università di Torino, Dip. di Fisica Sperimentale, INFN-Sezione di Torino, via P. Giuria 1, I-10125 Torino Italy |
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Keywords: gamma-rays instruments and techniques 07.85, Monte Carlo Methods 02.50.N, 02.70.L, solid state detectors 29.40.W, Ion Beam Microscopy 07.78 |
ABSTRACT
Collection efficiency profiles as determined by the Ion Beam Induced Charge (IBIC) technique have been considered to evaluate the spectroscopic performances of a cadmium telluride (CdTe) nuclear radiation detector. The dependence of such profiles on the applied bias voltage and the shaping time are presented and discussed on the basis of a theoretical model, which is also used to evaluate the electron/hole collection lengths profiles.
Experimental collection efficiency profiles were used as input data of the "ISIDE" Monte Carlo programme to simulate the CdTe response to gamma rays produced by 57Co. A systematic investigation of such spectra obtained under different detection conditions shows the effects of non constant collection efficiency profiles and ballistic deficit on the energy resolution of the detector.
