... As seen from the alpha particle testing, the spectrometry performance of the CPS32 is limited by peripheral hits and pixel-to-pixel variability, issues unrelated to radiation effects. ... First, it is important to note that, up to the 10 krad dose tested, the CPS32 remained entirely functional. The dominant total dose effect was an increase in the 25єC dark current of 0.58 nA/cm 2 /krad. ... Thus, for imaging, the dark current FPN is likely to be the main performance limitation. ...