Spectral Resolution

The spectral resolution has been measured in the laboratory with detectors that are representative of the flight units, and afterwards with flight model detectors and pre-amplifiers. An example spectrum obtained in this way is shown in Figure . The measured energy resolution as a function of energy for an individual detector is given in Figure .

Figure: Example spectrum taken with laboratory detector units, representative of the onboard ones.

Figure: The measured energy resolution of an individual SPI detector. This was measured using laboratory detectors. The resolution of the full instrument with all 19 detectors is slightly lower than this.