Epithermal neutron distribution (epithermal neutron flux)
Input(s)
\(N_{N}\): Source Strength (neutrons/s)
\(\mathrm{r}\): Distance from Source \((\mathrm{cm})\)
\(L_{e}\): Slowing Down Length \((\mathrm{cm})\)
\(D_{e}\): Epithermal Diffusion Coefficient \((\mathrm{cm})\)
Output(s)
\(\psi_{e}(r)\): Epithermal Neutron Flux at a Distance (r) from the Source (neutrons \(/ \mathrm{cm}^{2} / \mathrm{s}\) )
Formula(s)
\[
\psi_{e}(r)=\left(\frac{N_{\mathrm{N}}}{4 * \pi * D_{e}}\right) * \frac{\exp \left(-\frac{r}{L_{e}}\right)}{r}
\]
Reference(s)
Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 2, Page: 39.