Interim report: mammographic exposures at the breast cancer detection demonstration project screening centers

In the interests of uniformly high radiological physics standards at ACS-NCI Breast Cancer Detection Demonstration Projects, measurements were made at 29 breast cancer screening clinics. These measurements were made throughout the country with equipment calibrated with standards traceable to National Bureau of Standards. Histograms which indicate the frequency distribution of exposures to the surface of a 6 cm breast for various machine/receptor combinations were prepared.