[Testing the characteristics of X-ray apparatuses by using test cassette]

An X-ray TKP-1 M test cassette has been designed for effective testing of the basic operational parameters of X-ray diagnostic apparatuses that most frequently require inspection and adjustment during their use. The use of the cassette makes it possible to check the values of anode voltage on the basis of the improved double exposure method that simultaneously exposes two comparable parts of an X-ray film. Equivalent filtration is accomplished by a rotary shutter having sector slots, whose total angle is 30 degrees, which ensures 12-fold reduction in X-ray radiation at the site of disk rotation. A diaphragm and a step circular copper attenuating wedge are located in alignment with the shutter, each step ensures 12-fold reduction in radiation of certain power (at 40, 44, 48, 52, 57 kV, etc.). The pattern and pulsation of anode voltage and the duration of exposure are assessed by the pattern of an image of the small-diameter hole in the shutter. The perpendicularity of a radiation beam and alignment of an indicator are estimated by the shape of an image of the central vertical longitudinal hole.