The performance of new detection technologies like the ambient temperature cadmium--zinc--telluride (CdZnTe) detectors is of interest for search and identification of radioactive material in a range of applications. Various types of CdZnTe detectors that are currently available on the market as well as some specially designed ones were tested and characterised. The examination included peak shape, energy-resolution, energy-range and also the usability in hand-held applications. Additionally, the effects of the use of a cooling system were evaluated.