Thanks Micheal, the plates in question are new. We purchased the system as a turn key system. I have found that exposing the plate to a white light source seems to remove the latent images. My main concern is with the fading. I am having a light box constructed to make it more convenient to erase the plate after each shot, while not slowing production. I have read that the energy used in CR should be reduced as much as 15% from film. I have not found this to be the case. Most specs require 2-2t sensitivity, at the reduced energy I have found this to be a difficult task. I have tried to adjust the kvp starting from 600mas and it is very tricky to juggle the sensitivity with the density/grayscale, often a change of 1 or 2 kv will result in a large change in the image. Anyone else using CR having these problem's?
What have you done to manage sucess with CR and gamma? We are having issues seeing the same defects on CR as we see on film.
Our major justification for this system was gamma use - we have seen results where everything looks good when vendor is here, then another day after they are gone we have poor results.
5" of Zirc should be almost do able with Ir 192 using HR image plates.
My experience with Co 60 and CR is limited to looking for gross defects on very thick steel.
For the quality level you are looking for I doubt that you can get there with CR and Cobalt.
I expect it will be some time before CR quality can completely match film.
As you know, CR image plates are way more sensitive to radiation than film. Especially with Cobalt you need to pay serious attention to back scatter. You cannot get away with what you would normally use for film. Put lots of lead on the back of the cassette