Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons

Harrison, G H; Balcer-Kubiczek, E K

doi:10.2307/3575261

Title: Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons

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Abstract

Specialized experiments were performed to determine whether the neutron oxygen enhancement ratio (OER) changes significantly as the mean energy increases above 25 MeV. The experimental design called for OER measurements at two energies in the same experiment. The neutron production reaction d(80) + (Be + Ta) generated a beam with mean energy 38 MeV; upon rotation of the target, d(80) + (Ta + Be) neutrons were generated with mean energy 25 MeV. Suspensions of the bacterium Serratia marcesens were irradiated in oxic-hypoxic pairs, alternately with high- and lower-energy neutrons. Replicate experiments yielded OER values and 95% confidence limits of 2.25 (2.05, 2.50) at 25 MeV and 1.67 (1.57, 1.79) at 38 MeV. The x-ray OER was 3.3 (3.1, 3.5). The significant decrease in OER supports our results with Vicia faba showing OER values of 1.7, 1.4, and 2.6 for 25- and 38-MeV neutrons and for x rays, respectively. The yield of spallation products with mass number 6, 7, 9, 10, and 11 arising from neutrons interacting in tissue was analyzed. The tissue kerma from such product contribute kerma equal to 15 to 30% of the recoil proton kerma and thus may provide the physical basis for the observed OER reductionmore » at high neutron energies.« less

Authors:: Harrison, G H; Balcer-Kubiczek, E K

Publication Date:: Tue Jul 01 00:00:00 EDT 1980

Research Org.:: Univ. of Maryland, Baltimore

OSTI Identifier:: 5025301

Resource Type:: Journal Article

Journal Name:: Radiat. Res.; (United States)

Additional Journal Information:: Journal Volume: 83:1

Country of Publication:: United States

Language:: English

Subject:: 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; FAST NEUTRONS; OXYGEN ENHANCEMENT RATIO; SERRATIA; BIOLOGICAL RADIATION EFFECTS; VICIA; ANOXIA; COMPARATIVE EVALUATIONS; GROWTH; KERMA; MEV RANGE 10-100; NEUTRON THERAPY; RADIATION DOSES; SURVIVAL CURVES; X RADIATION; BACTERIA; BARYONS; BIOLOGICAL EFFECTS; DOSES; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRONS; IONIZING RADIATIONS; LEGUMINOSAE; MEDICINE; MEV RANGE; MICROORGANISMS; NEUTRONS; NUCLEAR MEDICINE; NUCLEONS; PLANTS; RADIATION EFFECTS; RADIATIONS; RADIOLOGY; RADIOTHERAPY; THERAPY; 560131* - Radiation Effects on Microorganisms- Basic Studies- (-1987); 560141 - Radiation Effects on Plants- Basic Studies- (-1987)

Citation Formats


                    Harrison, G H, and Balcer-Kubiczek, E K. Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons.  United States: N. p., 1980. 
        Web.  doi:10.2307/3575261.

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                    Harrison, G H, & Balcer-Kubiczek, E K. Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons.  United States.  https://doi.org/10.2307/3575261

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                    Harrison, G H, and Balcer-Kubiczek, E K. 1980.  
        "Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons".  United States.  https://doi.org/10.2307/3575261.

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@article{osti_5025301,

  title        = {Oxygen enhancement ratio for d(800) + (Be + Ta) and d(800) + (Ta + Be) neutrons},

  author       = {Harrison, G H and Balcer-Kubiczek, E K},

  abstractNote = {Specialized experiments were performed to determine whether the neutron oxygen enhancement ratio (OER) changes significantly as the mean energy increases above 25 MeV. The experimental design called for OER measurements at two energies in the same experiment. The neutron production reaction d(80) + (Be + Ta) generated a beam with mean energy 38 MeV; upon rotation of the target, d(80) + (Ta + Be) neutrons were generated with mean energy 25 MeV. Suspensions of the bacterium Serratia marcesens were irradiated in oxic-hypoxic pairs, alternately with high- and lower-energy neutrons. Replicate experiments yielded OER values and 95% confidence limits of 2.25 (2.05, 2.50) at 25 MeV and 1.67 (1.57, 1.79) at 38 MeV. The x-ray OER was 3.3 (3.1, 3.5). The significant decrease in OER supports our results with Vicia faba showing OER values of 1.7, 1.4, and 2.6 for 25- and 38-MeV neutrons and for x rays, respectively. The yield of spallation products with mass number 6, 7, 9, 10, and 11 arising from neutrons interacting in tissue was analyzed. The tissue kerma from such product contribute kerma equal to 15 to 30% of the recoil proton kerma and thus may provide the physical basis for the observed OER reduction at high neutron energies.},

  doi          = {10.2307/3575261},

  url          = {https://www.osti.gov/biblio/5025301},
  journal      = {Radiat. Res.; (United States)},
number       = ,

  volume       = 83:1,

  place        = {United States},

  year         = {Tue Jul 01 00:00:00 EDT 1980},

  month        = {Tue Jul 01 00:00:00 EDT 1980}

}

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