[Results of a study on roentgen film processing in automatic film-developing systems].

100 X-ray film developing machines in 72 institutes were tested for accuracy of reproduction of the film developing systems by means of sensitometric methods for a period of 9 months. If we assume the sensitivity index to be D = 1.0 with a maximum variation of +/- 0.2, one-third of the machines in this test are not within the standard range. Hence, to ensure maximum utilisation of the sensitivity of the film processing systems, it will be necessary to keep a close check on the development process.