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The Nuclear Spectroscopic Telescope Array (NuSTAR) will be the first spacemission to focus in the hard X-ray (5-80 keV) band. The NuSTAR instrumentcarries two co-aligned grazing incidence hard X-ray telescopes. Each NuSTARfocal plane consists of four 2 mm CdZnTe hybrid pixel detectors, each with anactive collecting area of 2 cm x 2 cm. Each hybrid consists of a 32 x 32 arrayof 605 micron pixels, read out with the Caltech custom low-noise NuCIT ASIC. Inorder to characterize the spectral response of each pixel to the degreerequired to meet the science calibration requirements, we have developed amodel based on Geant4 together with the Shockley-Ramo theorem customized to theNuSTAR hybrid design. This model combines a Monte Carlo of the X-rayinteractions with subsequent charge transport within the detector. Thecombination of this model and calibration data taken using radioactive sourcesof Co-57, Eu-155 and Am-241 enables us to determine electron and holemobility-lifetime products for each pixel, and to compare actual to idealperformance expected for defect-free material.

Spectral calibration and modeling of the NuSTAR CdZnTe pixel detectors