Difference between revisions of "Kerma"
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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]] | [[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]] | ||
| − | Quantity for ionising uncharged particles, defined by the quotient of <math>dE_{tr}</math> by <math>dm</math>, where <math>dE_{tr | + | Quantity for ionising uncharged particles, defined by the quotient of <math>dE_{tr}</math> by <math>dm</math>, where <math>dE_{tr}</math> is the mean sum of the initial kinetic energies of all the charged particles liberated in a mass <math>dm</math> of a material by the uncharged particles incident on <math>dm</math>, thus: |
<math> | <math> | ||
| − | K = \frac{ | + | K = \frac{dE_{tr}}{dm} |
</math> | </math> | ||
The SI unit of kerma is joule per kilogram (J kg<sup>-1</sup>), and its special name is [[gray]] (Gy). | The SI unit of kerma is joule per kilogram (J kg<sup>-1</sup>), and its special name is [[gray]] (Gy). | ||
| − | [[ICRP Publication 116]], 2010 | + | ‘Kerma’ is an acronym for ‘kinetic energy released in a mass’. |
| + | |||
| + | (Adapted from [[ICRP Publication 116]], 2010) | ||
'''Return to [[ICRP Glossary|Glossary]]''' | '''Return to [[ICRP Glossary|Glossary]]''' | ||
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== Previous glossary entries == | == Previous glossary entries == | ||
| − | === from [[ICRP Publication | + | === from [[ICRP Publication 103]], 2007; [[ICRP Publication 119]], 2012; [[ICRP Publication 120]], 2012; [[ICRP Publication 135]], 2017; and [[ICRP Publication 136]], 2011 === |
| + | |||
| + | The quotient of the sum of the kinetic energies, <math>dE_{tr}</math>, of all charged particles liberated by uncharged particles in a mass <math>dm</math> of material, and the mass <math>dm</math> of that material. | ||
| + | |||
| + | <math> | ||
| + | K = \frac{dE_{tr}}{dm} | ||
| + | </math> | ||
| + | |||
| + | Kerma is defined as a non-stochastic quantity and <math>dE_{tr}</math> is the expectation value of the sum of the kinetic energies. The unit for kerma is joule per kilogram (J kg<sup>-1</sup>) and its special name is [[gray]] (Gy). | ||
Latest revision as of 14:12, 7 September 2021
Quantity for ionising uncharged particles, defined by the quotient of [math]dE_{tr}[/math] by [math]dm[/math], where [math]dE_{tr}[/math] is the mean sum of the initial kinetic energies of all the charged particles liberated in a mass [math]dm[/math] of a material by the uncharged particles incident on [math]dm[/math], thus:
[math] K = \frac{dE_{tr}}{dm} [/math]
The SI unit of kerma is joule per kilogram (J kg-1), and its special name is gray (Gy).
‘Kerma’ is an acronym for ‘kinetic energy released in a mass’.
(Adapted from ICRP Publication 116, 2010)
Return to Glossary
Previous glossary entries
from ICRP Publication 103, 2007; ICRP Publication 119, 2012; ICRP Publication 120, 2012; ICRP Publication 135, 2017; and ICRP Publication 136, 2011
The quotient of the sum of the kinetic energies, [math]dE_{tr}[/math], of all charged particles liberated by uncharged particles in a mass [math]dm[/math] of material, and the mass [math]dm[/math] of that material.
[math] K = \frac{dE_{tr}}{dm} [/math]
Kerma is defined as a non-stochastic quantity and [math]dE_{tr}[/math] is the expectation value of the sum of the kinetic energies. The unit for kerma is joule per kilogram (J kg-1) and its special name is gray (Gy).
