  Coplanar-grid (CPG) particle detectors were designed for materials such as
CdZnTe (CZT) in which charge carriers of only one sign have acceptable
transport properties. The presence of two independent anode signals allows for
a reconstruction of deposited energy based on the difference between the two
signals, and a reconstruction of the interaction depth based on the ratio of
the amplitudes of the sum and difference of the signals. Energy resolution is
greatly improved by modifying the difference signal with an empirically
determined weighting factor to correct for the effects of electron trapping. In
this paper is introduced a modified interaction depth reconstruction formula
which corrects for electron trapping utilizing the same weighting factor used
for energy reconstruction. The improvement of this depth reconstruction over
simpler formulas is demonstrated. Further corrections due to the contribution
of hole transport to the signals are discussed.
