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__NOTOC__A characteristic constant for a radionuclide, which is defined in terms of an ideal point source, as <math> \Gamma _\delta =</math> <math>\frac{\iota^2\ \dot{K}_\delta}{A} </math> , where <math> \dot{K}_\delta</math>is the air-kerma rate due to photons (gamma and x rays) of energy greater than δ at a distance <math>\iota</math> in a vacuum from a point source of the radionuclide of activity A.(adaoted Adapted from [[ICRP Publication 107]])

''[[ICRP Glossary]] entry - 22 February 2019''

<div id="collapse01" class="mw-collapsible mw-collapsed"> <div class="mw-collapsible-toggle"> <div class="mw-collapsible-toggle-row"> <div class="mw-collapsible-toggle"><span style="color:#ffffff;">[see more/less]</span></div> </div> </div><br /> <div class="mw-collapsible-content"> [http://www.icrp.org/publication.asp?id=ICRP%20Publication%20107 '''Return to [[ICRPGlossary|Glossary]]''' '''''Publication 107'''''] Glossary (Ann. ICRP 38(3), 2008) <blockquote>This constant, a characteristic of a radionuclide, is defined in terms of an ideal point source, as <math> \Gamma _\delta =</math> <math>\frac{\iota^2\ \dot{K}_\delta}{A} </math> , where <math> \dot{K}_\delta</math> is the air-kerma rate due to photons (gamma and x rays) of energy greater than δ at a distance l in a vacuum from a point source of the radionuclide of activity A.</blockquote>   </div> </div>