Self-Shielding in Stacked Foils
- Aerojet Nuclear Co., Idaho Falls, ID (United States)
Both theoretical and experimental work on self-shielding in a stack of 5 mil gold foils is reported. The theoretical work assumes first flight encounters of neutrons from an isotropic flux in a thin infinite slab. Formulas for the perturbed flux and for the induced activity are derived. Calculated activities are then fitted to the observed activities. This procedure is thus an extension of the sandwich foil technique. A significant conclusion to be drawn from these results is that this technique provides a means for measuring flux spectra by the use of stacks of foils of relatively few absorbers. The technique does not depend on the existence of an isolated, high-intensity resonance and no correction for background cross sections is needed. A large number of foils of a small number of absorbers replaces a few foils of a limited number of suitable absorbers. Thus, the number of points in a spectrum can be increased beyond the limit fixed by the availability of suitable absorbers. This report forms the basic reference for additional work with other absorbers and mixtures. of absorbers.
- Research Organization:
- Aerojet Nuclear Co., Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AT(10-1)-1375
- NSA Number:
- NSA-27-008884
- OSTI ID:
- 4578083
- Report Number(s):
- ANCR-1066
- Country of Publication:
- United States
- Language:
- English
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