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Albedos

In the third case we use the net current of the flux at the core boundary by defining

$$\hspace{0.2ex}\underline{j}{}\hspace{0.15ex}_{in}^g(\hspace... ...pace{0.15ex} = \hspace{0.2ex}\underline{R}{}\hspace{0.15ex}(s)$$ (1.10)

where $\alpha^{g' \rightarrow g}$ is the so-called albedo and the group g net current^1.8 $\hspace{0.2ex}\underline{j}{}\hspace{0.15ex}^g$ is defined by (using the diffusion approximation, ie Fick's law)

$$\hspace{0.2ex}\underline{j}{}\hspace{0.15ex}^g(\hspace{0.2e... ...x}) \nabla\phi^g(\hspace{0.2ex}\underline{r}{}\hspace{0.15ex})$$ (1.11)

in units of [neutrons/( $\mbox{cm}^2 \cdot \mbox{s})$]. The fraction of the outgoing current in group g' which is scattered back into group g is determined by the albedo. The obvious problem with this method is the determination of albedos--a way to evaluate these values is to use Monte Carlo methods but it is important to remember that the results are dependent on the flux solution.

 
 

 
 

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