Abstract
A series of absolute thermal neutron flux measurements and calculations is described in which AmBe and SbBe radioactive sources and D-T and D-D accelerator neutron sources (150 keV deuterons) were used. The radioactive sources were of a known absolute intensity; the output of the accelerator sources was found by the associated particle technique. The work was undertaken as part of a study of the suitability of non-reactor sources for thermal neutron radiography. The absolute flux distribution associated with an AmBe source in a 0.9 m cubical water moderator was measured with gold foil detectors and calibrated counting equipment. Other flux distributions for different sources and different sized systems were measured with manganese foils and scintillation detectors, and normalized against the AmBe flux. The measured distributions are compared with calculations based on transport and age-diffusion theory.
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