IEVref: | 881-04-54 | ID: | |

Language: | en | Status: Standard | |

Term: | exposure rate constant (deprecated) | ||

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Symbol: | Γ
_{δ} | ||

Definition: | for a gamma or X-ray emitting nuclide, the quotient of $l}^{2}{\left(\frac{\mathrm{d}X}{\mathrm{d}t}\right)}_{\delta$ 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
$\Gamma}_{\delta}=\frac{{l}^{2}}{A}{\left(\frac{\mathrm{d}X}{\mathrm{d}t}\right)}_{\delta$
A special unit of exposure rate constant is Rm NOTE – It is assumed that the attenuation in the source and along | ||

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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$\Gamma}_{\delta}=\frac{{l}^{2}}{A}{\left(\frac{\mathrm{d}X}{\mathrm{d}t}\right)}_{\delta$

A special unit of exposure rate constant is Rm^{2}h^{−1}Ci^{−1}.
*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 ^{226}Ra; a special unit is then Rm^{2}h^{−1}g^{−1}.