Nuclear Science and Engineering / Volume 50 / Number 3 / March 1973 / Pages 300-302
Technical Note / dx.doi.org/10.13182/NSE73-A28985
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In this Note an expression is derived for estimating the change in detector response due to perturbations in a fixed source system. This expression, developed with variational theory, includes a correction to first-order perturbation theory which accounts for the flux change caused by the perturbation. The derivation is extended to altered systems, and an expression is obtained which improves first-order perturbation theory by accounting for changes in the unaltered forward and adjoint fluxes. With this variational approach, all transport calculations can be performed in the unperturbed unaltered system.