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Proceedings Paper

Distinguishing spontaneous fission neutrons from cosmic-ray background
Author(s): Leon Forman; Peter E. Vanier; Keith E. Welsh
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Paper Abstract

We have measured the neutron spectra of cosmic-rays and a spontaneous fission emitting source (Cf-252) using a neutron double scatter spectrometer. The energy range of measurements was 0.1-10 MeV where the spectrometer efficiency is determined to be up to 8.7%, depending on the separation between detection planes. Our cosmic-ray neutron spectrum measurement is in good agreement with the sea-level data reported by Goldhagen and his co-workers. In the energy range 0.1-1.0 MeV, the cosmic-ray and Cf-252 spectra are different and separable. This difference is expected from the applicable models that describe the phenomena, 'equilibrium slowing down' (cosmic-rays) and 'Maxwellian kinetic temperature' emission (spontaneous fission). We show that >80% of Cf-252 neutrons and <25% of cosmic-ray related neutrons are emitted in this energy range of measurement, and conclude that neutron spectroscopy provides effective ways to distinguish a fission source from the cosmic-ray background.

Paper Details

Date Published: 26 October 2004
PDF: 10 pages
Proc. SPIE 5541, Penetrating Radiation Systems and Applications VI, (26 October 2004); doi: 10.1117/12.559603
Show Author Affiliations
Leon Forman, Brookhaven National Lab. (United States)
Peter E. Vanier, Brookhaven National Lab. (United States)
Keith E. Welsh, Stony Brook Univ. Hospital and Health Sciences Ctr. (United States)

Published in SPIE Proceedings Vol. 5541:
Penetrating Radiation Systems and Applications VI
F. Patrick Doty; Richard C. Schirato; H. Bradford Barber; Hans Roehrig, Editor(s)

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