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The EMI image intensifier used in the IPCS has a dark current of about 4 counts/cm/s. The noise level per pixel due to the dark current is proportional to the area of each pixel. The pixel size of the CCD-IPCS in standard spectroscopic format is 10.5 42 microns. implying a dark current of only 2 counts per pixel per 10 seconds.

Tue Aug 15 16:42:46 BST 1995