ANALYSIS OF THE MOMENTS METHOD EXPERIMENT
Monte Cario calculations show the effects of a plane water-air boundary on both fast neutron and gamma dose rates. Multigroup diffusion theory calculation for a reactor source shows the effects of a plane water-air boundary on thermal neutron dose rate. The results of Monte Cario and multigroup calculations are compared with experimental values. The predicted boundary effect for fast neutrons of 7.3% agrees within 16% with the measured effect of 6.3%. The gamma detector did not measure a boundary effect because it lacked sensitivity at low energies. However, the effect predicted for gamma rays of 5 to 10% is as large as that for neutrons. An estimate of the boundary effect for thermal neutrons from a PoBe source is obtained from the results of muitigroup diffusion theory calcuiations for a reactor source. The calculated boundary effect agrees within 13% with the measured values. (auth)
- Research Organization:
- Convair, Fort Worth, Tex.
- DOE Contract Number:
- AF33(600)-38946
- NSA Number:
- NSA-13-021467
- OSTI ID:
- 4232660
- Report Number(s):
- NARF-59-33T; FZK-9-138; Project 6(1-9964)
- Resource Relation:
- Other Information: Project 6(1-9964). Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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