This standard is applicable to X-RAY SOURCE ASSEMBLIES and X-RAY TUBE ASSEMBLIES containing ROTATING ANODE X-RAY TUBES, for use in MEDICAL DIAGNOSTIC RADIOLOGY for techniques in which the X-RAY PATTERN will be received simultaneously in all points of the IMAGE RECEPTION AREA. Unless otherwise specified, this standard is applicable to an X-RAY TUBE ASSEMBLY with a brand-new ROTATING ANODE X-RAY TUBE. This standard does not apply to X-RAY SOURCE ASSEMBLIES and X-RAY TUBE ASSEMBLIES for special applications, when for example steeper variations of the AIR KERMA RATE or particular distributions are intended.