FIELD: medical X-ray equipment, in particular devices for determination and monitoring of equipment for determination and monitoring of equipment technical characteristics. SUBSTANCE: the device has a text-object made in the form of a truncated circular cone with a radius of the larger base equal to 90 to 110 mm, positioned on the outer surface of the text-object made of material that is transparent to X-rays, uniformly along the surface generatrix, are roentgenocontrast marks in the form of at least two parallel strips, 0.25 to 0.5 mm wide, one of which is provided with a roentgenocontrast scale. EFFECT: measurement of the thickness of the released layer irrespective of the original tuning of the orthopantomograph. 2 dwg
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