FIELD: medical X-ray equipment, in particular devices for measurement and monitoring of technical characteristics of radiodiagnostic apparatuses. SUBSTANCE: the absorber has a base installed in the entry plane of the X-radiation receiver of the radiodiagnostic apparatus under monitoring and in parallel with its lines, transparent for X-radiation, rigidly attached to the base is an n-stepped gradation wedge, transverse grooves are made between the steps throughout the entire length of the gradation wedge, whose length equals the width of the gradation wedge, and the width of the grooves is less than the width of the gradation wedge steps by 5 to 10 times. EFFECT: atomized process of determination of the contrast characteristics of radiodiagnostic apparatuses and, consequently, enhanced accuracy and truth of the obtained results. 1 cl, 3 dwg
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