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''ICRP Glossary entry - 22 February 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - 22 February 2019'' ==<span class="mw-collapsible-headline">Previous Versions</span>== <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 '''ICRP''' '''''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 where 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>