Abstract
The cassette, interspacer and film to be used for beam focus radiography were checked whether the existing one would bear to use for this new type of radiography or not.
After having examined those, the author reaches the conclusion that the industrial X-ray film (Fuji, type 80) is the most suitable, because the adequate density is obtainable during the course of therapy of 200-250 R. The edge of the cassette made of aluminum of round 1mm thick and the interspacer of mortopren are adequate for routine use, though slight increase of the scattering makes worse the contrast of the radiogram.
