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IBIS contains an on-board collimated radioactive
Na source.
This allows regular calibration of PICsIT at both the 511 keV line
(calibration to better than 1% in 4 hours) and 1275 keV (1% in 8 hours).
ISGRI can also use the 511 keV line, albeit at lower efficiency.
Any energy deposits from untagged photons will have an impact of
% on the overall continuum sensitivity between 100 keV and 2 MeV.
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