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The ratio of surface area of a sphere to that of a non-spherical body of equal mass, i.e. η = A<sub>0</sub>/A. (with regard to ellipsoids, such non-spherical shapes are defined by the body mass and the relative lengths of the minor and major axes). ([[ICRP Publication 108]], 2008, para 96)
''ICRP Glossary entry - May 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''