Queries, comments, suggestions? Please contact us.



Area Radiology and radiological physics / Ionizing radiations : quantities and units

IEV ref881-04-33

Symbol
μ en ρ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaeqiVd02aaSbaaSqaaiaabwgacaqGUbaabeaaaOqaaiabeg8aYbaaaaa@3AE3@

en
mass energy-absorption coefficient (of a material for indirectly ionizing particles)
the product of the mass energy transfer coefficient ( μ tr ρ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaabmaabaWaaSaaaeaacqaH8oqBdaWgaaWcbaGaaeiDaiaabkhaaeqaaaGcbaGaeqyWdihaaaGaayjkaiaawMcaaaaa@3C7F@ for that energy and (1– g) where g is the fraction of the energy of secondary charged particles that is lost to bremsstrahlung in the material

Note – When the material is air, μ en ρ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaeqiVd02aaSbaaSqaaiaabwgacaqGUbaabeaaaOqaaiabeg8aYbaaaaa@3AE3@ is proportional to the quotient of exposure by energy fluence in the usual case of constant W.


fr
coefficient d'absorption d'énergie massique (d'un matériau pour des particules indirectement ionisantes) m
produit du coefficient de transfert d'énergie ( μ tr ρ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaabmaabaWaaSaaaeaacqaH8oqBdaWgaaWcbaGaaeiDaiaabkhaaeqaaaGcbaGaeqyWdihaaaGaayjkaiaawMcaaaaa@3C7F@ d'une substance par (1– g), g étant la fraction de l'énergie des particules chargées secondaires perdue par rayonnement de freinage dans la substance

Note – Lorsque cette substance est l'air, μ en ρ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaeqiVd02aaSbaaSqaaiaabwgacaqGUbaabeaaaOqaaiabeg8aYbaaaaa@3AE3@ est proportionnel au quotient de l'exposition par la fluence énergétique dans le cas habituel où l'énergie moyenne par paire d'ions W est constante.


ar
معامل إمتصاص طاقة الكتلة لمادة (لجسيمات غير مباشرة التأين)

es
coeficiente másico de absorción de energía (de un material para partículas indirectamente ionizantes)

it
coefficiente massico di assorbimento di energia

ko
질량 에너지 흡수 계수, 간접 이온화 입자체

ja
質量エネルギー吸収係数

pl
masowy współczynnik pochłaniania energii

pt
coeficiente mássico de absorção de energia (de um material para partículas indirectamente ionizantes)

sv
massenergiabsorptionskoefficient

Publication date: 1983-01
Copyright © IEC 2020. All Rights Reserved.