Little Boy neutron spectrum below 3 MeV

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The leakage neutron spectrum from the Little Boy replica has been measured from 12 keV to 3 MeV using a high-resolution /sup 3/He ionization chamber, and from 1 keV to 3 MeV using proton-recoil proportional counters. The /sup 3/He-spectrometer measurements were made at distances of 0.75 and 2.0 m from the active center and at angles of 0/sup 0/, 45/sup 0/, and 90/sup 0/ with respect to the axis of the assembly. Proton-recoil measurments were made at 90/sup 0/ to the assembly axis at distances of 0.75 and 2.0 m, with a shielded measurement made at 2.0 m to estimate ... continued below

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Pages: 11

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Evans, A.E.; Bennett, E.F. & Yule, T.J. January 1, 1984.

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The leakage neutron spectrum from the Little Boy replica has been measured from 12 keV to 3 MeV using a high-resolution /sup 3/He ionization chamber, and from 1 keV to 3 MeV using proton-recoil proportional counters. The /sup 3/He-spectrometer measurements were made at distances of 0.75 and 2.0 m from the active center and at angles of 0/sup 0/, 45/sup 0/, and 90/sup 0/ with respect to the axis of the assembly. Proton-recoil measurments were made at 90/sup 0/ to the assembly axis at distances of 0.75 and 2.0 m, with a shielded measurement made at 2.0 m to estimate background due to scattering. The /sup 3/He spectrometer was calibrated at Los Alamos using monoenergetic /sup 7/Li(p,n)/sup 7/Be neutrons to generate a family of response functions. The proton-recoil counters were calibrated at Argonne by studying the capture of thermal neutrons by nitrogen in the counters, by observation of the 24-keV neutron resonance in iron, and by relating to the known hydrogen content of the counters. The neutron spectrum from Little Boy was found to be highly structured, with peaks corresponding to minima in the iron total neutron cross section. In particular, influence of the 24-keV iron window was evident in both sets of spectra. The measurements provide information for dosimetry calculations and also a valuable intercomparison of neutron spectrometry using the two different detector types. Spectra measured with both detectors are in essential agreement. 8 references, 7 figures, 2 tables.

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Pages: 11

Notes

NTIS, PC A02/MF A01; 1.

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  • 29. annual meeting of the Health Physics Society, New Orleans, LA, USA, 3 Jun 1984

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  • Other: DE84012631
  • Report No.: LA-UR-84-1523
  • Report No.: CONF-840627-3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6809066
  • Archival Resource Key: ark:/67531/metadc1189945

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  • January 1, 1984

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Oct. 9, 2018, 3:58 p.m.

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Evans, A.E.; Bennett, E.F. & Yule, T.J. Little Boy neutron spectrum below 3 MeV, article, January 1, 1984; United States. (https://digital.library.unt.edu/ark:/67531/metadc1189945/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.