...
(CTI, trailing charge, correcting CTI for bkg and temperature)
Grant, et al. 2005, Proc. SPIE, 5898
Long-term trends in radiation damage of Chandra X-ray CCDs
http://adsabs.harvard.edu/abs/2005SPIE.5898..201G
LaMarr, et al. 2008, Proc SPIE, 7011, 66
Front- and back-illuminated x-ray CCD performance in low- and high-Earth orbit: performance trends of Suzaku XIS and Chandra ACIS detectors
http://adsabs.harvard.edu/abs/2008SPIE.7011E..66LGrant, et al. 2005, Proc. SPIE, 5898
Long-term trends in radiation damage of Chandra X-ray CCDs
http://adsabs.harvard.edu/abs/2005SPIE.5898..201G
The ACIS monitoring web pages (updated monthly):
http://space.mit.edu/~cgrant/monitor.html
...