Oxygen enhancement ratio as a function of neutron energy with mammalian cells in culture. [Chinese hamster cells (V79)]

Journal Article · Sun Apr 01 00:00:00 EST 1979 · Radiat. Res.; (United States)

DOI:https://doi.org/10.2307/3575004· OSTI ID:6312283

Rini, F J; Hall, E J; Marino, S A

Chinese hamster cells (V79) in culture under oxic and hypoxic conditions were irradiated with several neutron beams spanning a wide energy range to determine the oxygen enhancement ratio (OER). Eight essentially monoenergetic neutron beams, ranging from 0.22 to 13.6 MeV and a 0.11-MeV neutron spectrum, were produced at the Radiological Research Accelerator Facility (RARAF) at Brookhaven National Laboratory. Additional experiments were performed at the Naval Research Laboratory, Washington, DC, where neutrons are produced for radiotherapy by bombarding a beryllium target with 35-MeV deuterons. This beam has a broad energy spectrum with a mean energy of about 15 MeV. A maximum OER of about 1.9 was observed for 13.6-MeV neutrons. The OER values of the monoenergetic neutrons decreased with energy, plateaued at about 1.45 for the energy range from 0.22 to 2.0 MeV and increased slightly to about 1.55 for lower energy spectrum. In the light of microdosimetric data obtained for the neutron beams at RARAF, the OER appears to depend primarily on the intermediate-LET secondaries produced by neutrons in tissue, such as protons, while in contrast high LET-secondaries, such as ..cap alpha..-particles and recoil ions, play a minor role. The studies using the NRL neutron beam resulted in a lower OER of about 1.67 as compared to the monoenergetic 13.6-MeV beam. This is a consequence of the fact that more of the dose is deposited by intermediate LET secondaries for the NRL neutron beam.

• Research Organization: Columbia Univ., New York, NY (United States)
• OSTI ID: 6312283
• Journal Information: Radiat. Res.; (United States), Vol. 78:1
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
NEUTRONS
OXYGEN ENHANCEMENT RATIO
OXYGEN
RADIOSENSITIVITY EFFECTS
ENERGY DEPENDENCE
SURVIVAL TIME
BIOLOGICAL RADIATION EFFECTS
ANIMAL CELLS
CELL CULTURES
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
GRAPHS
IN VITRO
IRRADIATION
ISOLATED VALUES
KEV RANGE 10-100
KEV RANGE 100-1000
LET
MEV RANGE 01-10
MEV RANGE 10-100
SURVIVAL CURVES
BARYONS
BIOLOGICAL EFFECTS
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY TRANSFER
FERMIONS
FLUIDS
HADRONS
INFORMATION
KEV RANGE
MEV RANGE
NONMETALS
NUCLEONS
NUMERICAL DATA
RADIATION EFFECTS
560121* - Radiation Effects on Cells- External Source- (-1987)