DOE-HDBK-1019/1-93NUCLEAR CROSS SECTIONS AND NEUTRON FLUXReactor Theory (Neutron Characteristics)NP-02Page 16Rev. 0Self-ShieldingIn some locations within the reactor, the flux level may be significantly lower than in other areasdue to a phenomenon referred to as neutron shadowingor self-shielding. For example, theinterior of a fuel pin or pellet will "see" a lower average flux level than the outer surfaces sincean appreciable fraction of the neutrons will have been absorbed and therefore cannot reach theinterior of the fuel pin. This is especially important at resonance energies, where the absorptioncross sections are large.SummaryThe important information in this chapter is summarized below.
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