FOIL DATA THICKNESS CORRECTIONS AS AFFECTED BY SELF-SHIELDING AND FLUX DEPRESSION
A method is presented for obtaining matched-foil data from irradiations of unmatched foils, by making use of the first derivative of published flux- perturbation formulas. It is necessary to treat thermal and resonance activation separately. It is shown that non-uniformity in thickness within a given foil is not normally an appreciable source of error, although the area of the foil should be well known. For the special case of 25-micron gold foils, it is shown that, for moderate thickness deviations from foil to foil, it is a good approximation to neglect the thermal flux perturbations and to assume that the foils are very thick to resonance neutrons, resulting in a rather simple weightcorrection formula. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- DOE Contract Number:
- W-31109-ENG-38
- NSA Number:
- NSA-16-033991
- OSTI ID:
- 4786304
- Report Number(s):
- TID-16733; UAC-6503; RED-EPM-9
- Country of Publication:
- United States
- Language:
- English
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