SYMPOSIA PAPER Published: 01 January 2007

The Neutron Spectrum of NBS-1


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.

Author Information

Heimbach, Craig, R.
National Institute of Standards and Technology, Gaithersburg, MD
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Developed by Committee: E10
Pages: 123–129
DOI: 10.1520/STP45434S
ISBN-EB: 978-0-8031-6242-6
ISBN-13: 978-0-8031-3412-6