Ground-based calibration and characterization of GRD of GECAM: 8-160 keV

Understand

As the main detector of the GECAM satellite, the calibration of the energy response and detection efficiency of the GRD detector is the main content of the ground-based calibration.

• The calibration goal requires the calibrated energy points to sample the full energy range (8 keV-2 MeV) as much as possible.
• The low energy band (8-160 keV) is calibrated with the X-ray beam, while the high energy band (>160 keV) with radioactive sources.
• This article mainly focuses on the calibration of the energy response and detection efficiency in the 8-160 keV with a refined measurement around the absorption edges of the lanthanum bromide crystal.