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A proposed set of photonuclear cross sections was used to calculate the neutron spectrum of a RaBe photoneutron source. The calculation used the gamma rays from 226Ra in equilibrium as a driver, transported the gamma rays through the materials of the source, calculated neutron production, and subsequent neutron scattering. The calculation produced 27 % more neutrons than measured, and predicted relatively more low-energy neutrons.
calibration, neutron, NBS-1, spectrum, photoneutron
Heimbach, Craig R.
Physicist, National Institute of Standards and Technology, Gaithersburg, MD