ATTENUATION OF GAMMA RADIATION IN A TWO-LEGGED 11-INCH RECTANGULAR DUCT
Results are presented of experiments carried out with an 11 x 11-in. duct in concrete with one right-angle bend, using Co/sub 60/ as a gamma-ray source. Experiments cover the effects of moving the source and detector off the centerline position, of replacing the inside concrete corner lip with one of lead, and of removing various scattering areas in the corner. Measured values of attenuation factors for the corner and second leg are compared with calculated values, using the LeDounx-Chilton analysis. The comparisons suggest that the analysis provides an adequate treatment of the single-scatter effect in the duct. Multiple-scatter effects, however, which are not taken into account by the analysis, apparently are responsible for approximately half of the radiation reaching the detector. An empirical expression is obtained which adequately represents most of the experimental results of duct measurements available at the present time. (auth)
- Research Organization:
- Naval Civil Engineering Lab., Port Hueneme, Calif.
- NSA Number:
- NSA-16-021692
- OSTI ID:
- 4815554
- Report Number(s):
- NP-11657; R-195
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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