Response to 'A comment on 'Signatures of fissile materials:High-energy gamma rays following fission,' by Zeev B. Alfassi'

Journal Article · Thu Jun 03 00:00:00 EDT 2004 · Nuclear Instruments and Methods A

DOI:https://doi.org/10.1016/j.nima.2004.06.138· OSTI ID:861577

Norman, Eric B; Prussin, Stanley G; Larimer, Ruth-Mary; Shugart, Howard; Browne, Edgardo; Smith, Alan R; McDonald, Richard J; Nitsche, Heino; Gupta, Puja; Frank, Michael I; Gosnell, Thomas B

Prof. Alfassi has pointed out that radionuclides that are not fission products, but which emit {gamma} rays with energies E{sub {gamma}} > 3 MeV, can be produced by neutron irradiation. He suggested that the decays of such activation products would interfere with the identification of fissionable materials. However, the combination of the energy spectrum and the temporal variation of the fission product gamma rays can be used to distinguish fissionable material from other nuclides. The activation of nuclides that could produce interferences will depend upon the specifics of the cargo and, possibly, the local surroundings. As discussed in our original publication, in addition to the steel that Prof. Alfassi referred to in his Comment, we studied the activation of wood, polyethylene, aluminum, and sandstone. Activation by thermal neutrons will always occur, and Prof. Alfassi correctly points out that nuclides such as {sup 49}Ca and {sup 37}S can be formed in this way. These nuclides are representative of most potential interferences. Both {sup 48}Ca and {sup 36}S have very low isotopic abundances (0.187% and 0.02%, respectively) and small thermal neutron capture cross sections (0.20 barns and 0.98 barns, respectively). In addition, their half lives are more than an order of magnitude longer than the gross average observed from the fission products, and more than two orders of magnitude longer than the lifetimes of the shorter-lived fission products that contribute significantly to the total intensity in the energy range of interest. These differences make it possible to distinguish between fission products and thermal neutron activation products. Prof. Alfassi also pointed out that interferences, of which {sup 16}N is likely to be the most important, can be produced by fast neutron reactions. (As described in our original publication, we did not use a 14 MeV generator in our work.) Fortunately, a judicious choice of the source neutron energy can limit the extent of these interferences quite significantly. For example, the laboratory threshold for the reaction {sup 16}O(n,p){sup 16}N is 10.2 MeV, while that for the reaction {sup 19}F(n,{alpha}){sup 16}N is 1.6 MeV. Thus a source neutron energy around 5 MeV would completely eliminate the {sup 16}O(n,p){sup 16}N reaction and limit the {sup 19}F(n,{alpha}){sup 16}N reaction to that portion of the cargo in which neutrons with energies greater than 1.6 MeV were present. However, even in the presence of {sup 16}N, the energy spectrum and temporal variation of the fission product gamma rays should be decisive in distinguishing fissionable material from these interferences.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Nuclear PhysicsDivision
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 861577
• Report Number(s): LBNL-55717; R&D Project: 463101; BnR: KB0401024; TRN: US0600047
• Journal Information: Nuclear Instruments and Methods A, Vol. 534, Issue 3; Related Information: Journal Publication Date: 12/01/2004
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
ALUMINIUM
CARGO
CROSS SECTIONS
ENERGY RANGE
FAST NEUTRONS
FISSION
FISSION PRODUCTS
FISSIONABLE MATERIALS
IRRADIATION
ISOTOPES
NEUTRONS
RADIOISOTOPES
STEELS
THERMAL NEUTRONS
WOOD