CORRECTION OF INCOMPLETE CHARGE COLLECTION IN CDTE DETECTORS

The characteristic of incomplete charge collection for several types o f planar CdTe spectrometers has been studied both theoretically and ex perimentally. The aim was to develop a theoretical function for correc ting the incomplete charge collection by correlating the charge collec ted with the position of interaction. We studied the dependence of thi s function on various parameters which characterize the crystal. Monte -Carlo calculations using the MCNP code were incorporated with a model function which included trapping and detrapping of the created charge . The calculations were utilized to determine the charge distribution and the risetime distribution for different detectors and irradiation configurations and for several photon energies. The charge correction function was correlated with experimental data to extract crystal para meters. It is shown that the correction function is useful when the de tectors are operated at high electric fields where applying this funct ion to experimental data improves the energy spectra significantly.