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Problems of Atomic Science and Technology, 2023
The concept of a concentrated neutron flux shaper for neutron capture therapy of cancer has been developed. A technique for two stage minimization of the accompanying fast neutron flux and gamma radiation background during the formation of a delayed therapeutic neutron flux is discussed.
Gokov, S.P. +4 more
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The concept of a concentrated neutron flux shaper for neutron capture therapy of cancer has been developed. A technique for two stage minimization of the accompanying fast neutron flux and gamma radiation background during the formation of a delayed therapeutic neutron flux is discussed.
Gokov, S.P. +4 more
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Nature, 1960
HAVING lectured for several years on the physics of nuclear reactors, we have often felt the need for a unit of neutron flux. It is comparatively easy to write “ns per cm.2 per sec.”, but much more clumsy to speak aloud the expression “neutrons per square centimetre per second” while lecturing.
R. D. HARRISON, N. THORLEY
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HAVING lectured for several years on the physics of nuclear reactors, we have often felt the need for a unit of neutron flux. It is comparatively easy to write “ns per cm.2 per sec.”, but much more clumsy to speak aloud the expression “neutrons per square centimetre per second” while lecturing.
R. D. HARRISON, N. THORLEY
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Journal of Geophysical Research, 1961
The equllibrium neutron-leakage spectrum at the lunar surface and the neutron capture as a function of depth beneath the surface were calculated for a number of assumed lunar surface compositions. The leakage spectrum is found to be particularly sensitive to hydrogen abundance; an experiment is accordingly proposed to determine the hydrogen content of ...
R. E. Lingenfelter +2 more
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The equllibrium neutron-leakage spectrum at the lunar surface and the neutron capture as a function of depth beneath the surface were calculated for a number of assumed lunar surface compositions. The leakage spectrum is found to be particularly sensitive to hydrogen abundance; an experiment is accordingly proposed to determine the hydrogen content of ...
R. E. Lingenfelter +2 more
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Neutron Flux and Energy Measurements
Physics in Medicine & Biology, 1966The problem of neutron energy measurement is considered in the energy ranges, thermal ( 15 MeV), together with the general problem of neutron flux measurement. Sensitivities and resolutions obtainable are given for a variety of methods. It is concluded that for thermal and intermediate energy measurements in radiological applications it is best to use
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Neutron Activation Analysis with Low Neutron Flux
IEEE Transactions on Nuclear Science, 1986Procedures are described for identifying and determining concentrations of trace impurities in minerals by means of neutron activation analysis with low neutron flux and standard gamma measurement equipment. Techniques developed in this work may be of use to those involved with the ever increasing need for mineral assays and for pollutant measurements,
M. Nomai +2 more
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The neutron flux in a spherical void
Annals of Nuclear Energy, 2005Abstract Using the basic theory developed in our earlier work (Cassell, J.S., Williams, M.M.R., 2005. Particle flux in an annular gap about a sphere, Annals of Nuclear Energy 32, 457, we have evaluated the neutron flux across a spherical void due to a point source in a moderating and absorbing medium.
J.S. Cassell +2 more
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Journal of Applied Physics, 1956
Application of the moment method of L. V. Spencer and U. Fano is made to the penetration and slowing down of neutrons in infinite media. General considerations are restricted mainly to those modifications of the method necessary for the neutron problem; in particular, a special technique is given for reducing the integral term of the neutron transport ...
Samuel S. Holland, Paul I. Richards
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Application of the moment method of L. V. Spencer and U. Fano is made to the penetration and slowing down of neutrons in infinite media. General considerations are restricted mainly to those modifications of the method necessary for the neutron problem; in particular, a special technique is given for reducing the integral term of the neutron transport ...
Samuel S. Holland, Paul I. Richards
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Measurement of Thermal Neutron Flux
IEEE Transactions on Nuclear Science, 1967A new technique has been developed for the measurement of thermal neutron flux. Small glass beads (~ 1 mm radius) are made black to thermal neutrons by the inclusion of B10. In addition, a 1/v activation such as cobalt, dysprosium, or indium is incorporated in the glass to measure the fluence (nv?t).
R. S. Carter +2 more
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Neutron flux uniformity in in vivo neutron activation analysis
Physics in Medicine & Biology, 1976Horowitz et al. (see ibid., vol.21, p.306, 1976), have recently criticized published work on in vivo neutron activation analysis for an implicit assumption that radiative capture cross-sections are everywhere negligible except at thermal energies, and have stated that this has led to undue emphasis being placed on thermal neutron flux uniformity in ...
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A calorimeter for neutron flux measurement
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1991Abstract A calorimeter for absolute neutron flux measurement has been built and tested. The calorimeter measures the heat produced when neutrons are captured via the 6 Li(n, 3 H) 4 He reaction. The sensitivity achieved was 1.3 × 10 6 n/s for a 1 h measurement. Comparisons with a 235 U fission chamber are in agreement.
J.M. Richardson +3 more
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