BS EN 60806:2004

INTRODUCTION
1 Scope and object
  1.1 Scope
  1.2 Object
2 Terminology
  2.1 Degree of requirements
  2.2 Definitions
3 Other international standards
4 Maximum symmetrical RADIATION FIELD
  4.1 Orientation of the maximum symmetrical RADIATION
      FIELD
  4.2 Distribution of AIR KERMA RATE
  4.3 Maximum AIR KERMA RATE
5 Measurement of the distribution of AIR KERMA RATE
  5.1 Measuring arrangement
  5.2 Measuring conditions
6 Compliance
  6.1 Assessment of compliance
  6.2 Statement of compliance
APPENDIX A - Index of terms
APPENDIX B - Determination of AIR KERMA RATE by radiographic
             densitometric measurement

Applies 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.

1.1 Scope 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. 1.2 Object This standard describes a method for the determination of the greatest geometrically symmetrical radiation field at a specified distance from the focal spot for which the percentage air kerma rate along the major axes does not fall below a permitted value. Fig. 1 Typical distribution of the relative air kerma rate along the major axis X of a maximum symmetrical radiation field