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THE EFFECT OF BORON-10 SHIELDS ON THE CALIBRATION OF NEUTRON-THRESHOLD DETECTORS
ARMY NUCLEAR DEFENSE LAB EDGEWOOD ARSENAL MD
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The threshold-detector system is calibrated by exposing bare foils to a known neutron flux. When measuring an unknown neutron source, these calibrated foils are exposed in boron-10 shields. The effect of these shields on the measured flux and spectrum is discussed. The results include comparison of data obtained from threshold detectors exposed to a neutron field 1 in a steel sphere whose periphery is filled with boron-10 2 in a pressed and sintered boron-10 shield 3 in a cadmium capsule and 4 unshielded. There was no significant difference between results obtained from threshold detectors exposed in a pressed and sintered boron-10 shield and the results obtained from threshold detectors exposed in a steel sphere with a boron-10 periphery. The cadmium container and spacers that hold the threshold detectors in the boron-10 shield have no significant effect on the measured neutron flux and spectrum. There is a measurable effect of the boron-10 shield on the neutron flux and spectrum as detected by the threshold detectors within the shield. A 30 neutron-attenuation factor is observed for the sulfur-threshold detector. Author
APPROVED FOR PUBLIC RELEASE