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It is used to detect low contrast of X light machine. It is composed of four pieces of die body to simulate human body attenuation.
Two 18cm x 18cm x 2cm aluminum plate (simulated human attenuation)
A 18cm * 18cm x 0.8mm aluminum plate with two rows of circular holes in diameter of 6.5mm, 4.5mm, 3mm, 2mm, 1.5mm; superimposed together to simulate the largest human body attenuation.
Meeting the verification regulation of "JJG 744-2004 medical diagnostic X ray radiation source"
WS 76-2011 standard for image quality control of medical conventional X ray diagnostic equipment