FIELD: radiography. SUBSTANCE: invention is meant for determination of geometric parameters of necessary correction of direction of radiation with exposure of extended defects with small expansion in process of radiography. Standard presents spiral of wire or strip which matching surfaces of turns are simulators of extended defects with small expansion in entire solid angle of exposure to radiation. Diameter of wire or width of strip are similar to thickness of used grove standard of sensitivity. EFFECT: enhanced accuracy of standard. 1 dwg, 1 tbl
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