Unfortunately, as so often happens, some of the links given above no longer work.
In their place, anyone interested in X-Ray QA could take a look at the
HARP website, which gives a lot of detailed information about testing various x-ray modalities.
Also the revised
NDE-Ed X-Rays section (which is excellent).
HARP: from the Healing Arts and Radiation Protection Act (HARPA) of Canada.
