Heavy ion target area fast neutron dose equivalent rates Page: 3 of 10
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scattering chamber and then into a Faraday cup which
monitors the beam current and stops the beam. The target
foil strips the electrons from the ion beam so that the
charge on the ions at the cup is approximately that of the
heavy ion nuclei. Points C and D are locations that the
experimenters occupied while making adjustments. Beam
currents were limited to less than one nA while experimenters
were present. Radiation surveys were made with higher beam
currents when no experimenters were present. The Faraday
cup where the beam stopped was the source of most of the
radiation. During the initial surveys beta-gamma measure-
ments were taken in addition to the neutron measurements
which are the primary subject of this paper; the beta-gamma
readings accounted for only 5 to 10% of the combined dose
equivalent rates.
The neutron dose equivalent rates were measured with
ORNL fast neutron survey meters. The survey meters were
calibrated with a 238Pu + Be source which provides neutrons
to approximately 6 MeV. The response of these instruments is
documented for neutrons up to 10 MeV (Gu78). At higher
energies the response is not well known. In the forward direc-
tion from the target, neutron energy spectra extended to much
higher energies (Ba78), but the high energy components decrease
rapidly with angle. For example, recently reported measure-
ments (Sy79) for 315 MeV 160 ions on a gold target show the
yield of high energy nucleons at 800 to be 2 to 3% of the
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Ohnesorge, W.F.; Butler, H.M.; Fulmer, C.B. & Mosko, S.W. Heavy ion target area fast neutron dose equivalent rates, article, January 1, 1979; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1108728/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.