Problems of Neutron Population in Localized Absorbers

On the basis of these two models, various quantities of interest may be calculated those to be discussed here are listed and defined below  

We will demonstrate later that the transmission coefficient (or transmittance, cf. Sec. 5.3a) is identical, from a physical standpoint, with our previous definition of the albedo [cf. Eq. (5.111)]. It is appropriate, then, to use the same symbol. 

These quantities will, of course, be related for any given physical situation, but there is no universal relation among them. However, there are derived quantities directly related  

The general principles for the calculation of the quantities defined in Eqs. (5.275) through (5.281) in the two extreme approximations may now be presented for the case of an absorber of general geometric configuration placed in an isotropic flux. 

L The Diffusion ModeL The diffusion equation is applied in the form 

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