Collection efficiency profiles as determined by the ion beam-induced charge
(IBIC) technique have been considered to evaluate the spectroscopic perfor
mance of a cadmium telluride (CdTe) nuclear radiation detector. The depende
nce of such profiles on the applied bias voltage and the shaping time are p
resented and discussed on the basis of a theoretical model, which is also u
sed 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 p
roduced by Co-57. A systematic investigation of such spectra obtained under
different detection conditions shows the effects of non constant collectio
n efficiency profiles and ballistic deficit on the energy resolution of the
detector. (C) 1999 Elsevier Science B.V. All rights reserved.