However, the experience shows that the quality of radiograph is not satisfactory. The density obtained deviates from the desired value. In order to avoid retakes and production delay a study is made to correlate the exposure available for the film in the typical radiographic geometry using digital dosimeter. Exposures are measured and correlated to film factor. With Cobalt-60 isotope, studies are made for different radiographic and specimen geometries and for different specimen (high) thickness.

A good relationship is obtained between the exposure time calculated from the exposure chart and the time calculated from the dose using film factor. The expected errors due to the use of Half value thickness and Inverse square law are avoided. This eliminates the trial and error multiple exposures, usually undertaken for difficult geometries using high energy.

The study is expected to provide an additional aid for high energy radiography which in turn would result in avoiding retakes and to keep up the production schedule.