Individual:
http://rdf.iit.demokritos.gr/2014/iaeaSafetyGlossary/id156
Annotations (2)
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nreo:canonicalLabel "[de minimis]" (en)
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skos:definition "<b>!</b> The appropriate terminology of 'exemption', 'clearance', etc., should be used in <br/>
'IAEA publications'.<br/>A general term used historically to describe concepts that would now be <br/>referred to by terms such as 'exemption' or 'clearance'. The term is also <br/>sometimes used to describe a related (and controversial) philosophy that <br/>'assessments' of 'collective dose' should exclude that portion delivered at very <br/>low 'individual dose rates'.<br/>The term 'de minimis' is still used in some specific contexts, such as the London <br/>Convention 1972 [13].<br/>Derived from the maxim ‘'de minimis' non curat lex’ (the law does not concern <br/>itself with trivia).<br/>
<b>decay constant, </b>'l'<br/>
For a radionuclide in a particular energy state, the quotient of d'P' by d't', <br/>
where d'P' is the probability of a given nucleus undergoing a spontaneous <br/>nuclear transition from that energy state in the time interval d't'.<br/>
'l '= d'P '= - 1 d'N '= 'A'<br/>
d't'<br/>
'N 'd't'<br/>
'N'<br/>
where 'N' is the number of nuclei of concern existing at time 't' and 'A' is the <br/>'activity'.<br/>
Unit: reciprocal second (s–1).<br/>The 'activity' is the 'decay constant' multiplied by the number of nuclei of the <br/>radionuclide present.<br/>The 'decay constant' is related to the 'radioactive half-life, T ', of the <br/>
1/2<br/>
radionuclide by the expression:<br/>
'l '= ln 2<br/>
'T'1/2<br/>" (en)
Types (1)
Usage (7)