Neutron Groups in the Spectrum of a PuF4 Source

Richard L. Lehman
Phys. Rev. 171, 1311 – Published 20 July 1968
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Abstract

The neutron spectrum of a 1-kg PuF4 laboratory neutron source was measured by use of nuclear track emulsion and a differentiation technique. The spectrum consists of a minor peak at 0.91 MeV and a major one at 1.55 MeV. The mean energy was found to be 1.35 MeV and the maximum energy 2.8 MeV. Special analysis of the track distribution revealed peaks at 0.91, 1.26, 1.44, 1.64, 1.8, and 2.1 MeV, and weaker ones at 0.5 and 2.5 MeV. The measured spectrum does not differ in principal features from an analytical spectrum obtained by a graphico-numerical study of published thin-target measurements. The analytical study predicts the effects on F(α, n)-source spectra when α emitters of different energy from Pu239 are employed, and permits an interpretation of some previously unexplained observations by Chadwick and Constable.

  • Received 28 December 1967

DOI:https://doi.org/10.1103/PhysRev.171.1311

©1968 American Physical Society

Authors & Affiliations

Richard L. Lehman

  • Department of Biophysics, Laboratory of Nuclear Medicine and Radiation Biology University of California School of Medicine, Los Angeles, California 90024

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Vol. 171, Iss. 4 — July 1968

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