Browsing by Author "Broomhall, GJ"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    The measurement of partial capture cross sections for neutron energies above 10 keV
    (Australian Atomic Energy Commission, 1974-05) Broomhall, GJ; Kenny, MJ; Martin, PW; Bird, JR
    A large Nal detector has been used to demonstrate the feasibility of measuring partial capture cross sections for neutron energies from 10 to 100 keV. The pulsed neutron source was a 3 MeV accelerator and the 7Li(p,n) reaction with a time resolution of 3 to 4 ns and flight paths of 0.6 to 1.5 m. The experimental techniques are described, and illustrated by results for high energy transitions following capture in 48Ti, 56Fe, 56Ni and 207Pb.
  • Thumbnail Image
    Item
    Radiation shielding of an 8 in x 6 in Nal(TI) crystal for use in keV neutron capture experiments.
    (Australian Atomic Energy Commission, 1971-11) Broomhall, GJ
    The sensitivity of large NaI(TI) detectors to background radiation inhibits their use in measuring partial neutron capture cross sections in the keV energy region. Major sources of neutron induced background are the iodine in the crystal and iron in structural materials. In a survey of possible neutron shielding materials, a 70 percent by weight mixture of boron carbide in paraffin most readily reduced keV neutron fluxes. The use of a multi-layered shield assembly, incorporating an inner sleeve of boron carbide and lead shot in a litharge/glycerine cement, gave a factor of 10 improvement in the counts-to-background ratio at the 37 keV resonance in 48Ti.
  • Thumbnail Image
    Item
    SI units in AAEC publications
    (Australian Atomic Energy Commission, 1973-04) Williams, GA; Broomhall, GJ
    This note was prepared in response to repeated requests from authors for information on SI units. It is a quick ready-reference only. A complete description of the International System of Units (the SI) will be published by the Metrication Committee. The text and tables are typed on an Alder electric typewriter and should be used by typists as a supplement to the Typing Guide.