Light fog on radiographic films: how to measure it properly.
A single step wedge imaging technique is described for the proper evaluation of light fog in radiographic darkrooms. Tests indicate that this technique is a more sensitive indicator of light fog than the conventional technique utilizing unexposed film. It is recommended that fog tests be carried out in radiographic darkrooms annually to maintain optimum radiographic image contrast.
D006801:Humans; D013679:Technology, Radiologic