The CZT detectors are primarily designed as gamma-ray devices (40 - 200 keV) to be operated at room temperature. We are using them as X-ray spectroscopic detectors in the 10 - 100 keV regions. To extend the low energy response to 10 keV, the devices are cooled to 10ºC (+/- 5ºC) but in some orbits the temperature can go up to 20ºC. The X-ray spectroscopic capabilities are examined critically in the full energy range and the results are given in this report. CZTI uses a Coded Aperture Mask (CAM) as an imaging device. Calibration of the CAM is done separately. Similarly, the efficacy of alpha-tagging and CsI veto anti-coincidence are dealt with separately. All X-ray photons registered in CZTI are time tagged to an accuracy of 20 µsec. This provided an unexpected bonus of using CZTI as an X-ray polarization instrument above about 150 keV. This aspect of the calibration is discussed separately.
- Evaluation of the dead, noisy, and bad pixels in CZTI
- X-ray spectroscopic calibration at various temperatures
- CAM Calibration
- Alpha-tagging in CZTI
- Veto calibration
- Time tagging, cross talk and polarization capability of CZTI
- Response matrix generation for CZTI
- Testing at various modes
- Calibration of the Integrated Flight Model