page_title: International Commission on Radiological Protection
section_title: Radiation quantities
hierarchical_section_title: International Commission on Radiological Protection / Radiation quantities
caption_attribution_description: English: Representation of the main dose quantities used in radiation protection based partly on Mattson and Soderberg: "Dose Quantities and Units for Radiation", Ch2 of "Radiation protection in nuclear medicine" Springer Verlag 2013. That in turn is based on ICRU report 57. This final graphic also incorporates an image by Rensselaer Polytechnic Institute entitled VIP-Man phantom developed by Dr. Xu and team at Rensselaer Polytechnic Institute in Troy, NY published in Wikimedia commons ref - Voxel Phantom - Visual Photographic Man (VIP-Man).jpg the purpose being to introduce the concept of a anthropomorphic phantom by using an image.
context_page_description: The International Commission on Radiological Protection is an independent, international, non-governmental organization, with the mission to provide recommendations and guidance on radiological protection concerning ionising radiation.
  It was founded in 1928 at the second International Congress of Radiology in Stockholm, Sweden and was then called the International X-ray and Radium Protection Committee. In 1950 it was restructured to take account of new uses of radiation outside the medical area, and given its present name.
  The ICRP is a sister organisation to the International Commission on Radiation Units and Measurements. In general terms ICRU defines the units, and ICRP recommends, develops and maintains the International System of Radiological Protection which uses these units.
context_section_description: In collaboration with the ICRU, the commission has assisted in defining the use of many of the dose quantities in the accompanying diagram.
  The table below shows the number of different units for various quantities and is indicative of changes of thinking in world metrology, especially the movement from cgs to SI units.
  Although the United States Nuclear Regulatory Commission permits the use of the units curie, rad, and rem alongside SI units, the European Union European units of measurement directives required that their use for "public health ... purposes" be phased out by 31 December 1985.
caption: External dose quantities used in radiation protection and dosimetry based on ICRU 57, jointly developed with the ICRP
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