NEUTRON ATTENUATION OF MAGNETITE CONCRETE HEATED TO 100 C
Neutron attenuation of Magnetite concrete heated to 100 deg C was measured in the DR shield test well. Gold and S foil detectors were used to deterraine fast, epithermal, and thermal fluxes at intervals through 48 in. of concrete. The fast neutron relaxation length is 9.52 cm, compared to 8.75 cm for the unheated concrete, a 9% increase as a result of this heating. Thermal and epitherraal attenuation curves show little indication that water loss has been sufficient to significantly change intermediate energy neutron leakage. Side to side traverses indicate the possibility that streaming up the edges of the well is affecting the measurements near the outside of tbe well. This does not affect the fast neutron relaxation length which is determined in the first 32 in of concrete. However, the thermal and epithermal traverses would normally be used to confirm the relaxation length in the outer part of the well where spectral equilibrium should be established. This procedure is not valid if serious streaming is present. (auth)
- Research Organization:
- General Electric Co. Hanford Atomic Products Operation, Richland, Wash.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-12-006308
- OSTI ID:
- 4331678
- Report Number(s):
- HW-53395
- Country of Publication:
- United States
- Language:
- English
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