IEVref:881-04-54ID:
Language:enStatus: Standard
Term: exposure rate constant (deprecated)
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Symbol: Γδ
Definition: for a gamma or X-ray emitting nuclide, the quotient of l 2 ( dX dt ) δ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadYgadaahaaWcbe qaaiaaikdaaaGcdaqadaqaamaalaaabaGaciizaiaadIfaaeaaciGG KbGaamiDaaaaaiaawIcacaGLPaaadaWgaaWcbaGaeqiTdqgabeaaaa a@3E47@ by A, where (dХ/dt)δ is the exposure rate due to photons of energy greater than δ at a distance l from a point source of this nuclide having an activity A

Γ δ = l 2 A ( dX dt ) δ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabfo5ahnaaBaaale aacqaH0oazaeqaaOGaeyypa0ZaaSaaaeaacaWGSbWaaWbaaSqabeaa caaIYaaaaaGcbaGaamyqaaaadaqadaqaamaalaaabaGaciizaiaadI faaeaaciGGKbGaamiDaaaaaiaawIcacaGLPaaadaWgaaWcbaGaeqiT dqgabeaaaaa@4366@

A special unit of exposure rate constant is Rm2h−1Ci−1.

NOTE – It is assumed that the attenuation in the source and along l is negligible. In the case of radium, the value of Γ is determined for a filter thickness of 0,5 mm platinum. Moreover, Γ is related not to the activity but to the mass of 226Ra; a special unit is then Rm2h−1g−1.


Publication date:1983-01
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Internal notes:2021-01-05: Distance capital ai "I" corrected to lower case ell "l" (x2). JGO
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