[A gamma-ray sensitometer for film-screen combinations in diagnostic radiology]

On account of the high cost of standardised x-ray equipment, a 5 Ci Am-241 gamma ray source (59.6 keV) was used for setting up a sensitometer. The exposure rate at the film cassette is adjusted by means of a variable distance (5-250 cm) from the source. Using exposure times of 2 sec, screens with sensitivities greater than 500 can be measured. The properties of the sensitometer are described.