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Life shortening in mice exposed to fission neutrons and. gamma. rays. II. Duration-of-life and long-term fractionated exposures. [/sup 60/Co]

Journal Article · · Radiat. Res.; (United States)
DOI:https://doi.org/10.2307/3575471· OSTI ID:6318054
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Data are presented on the life shortening of B6CF/sub 1/ mice given weekly exposures to 0.85-MeV fission neutrons (0.67, 1.67, 2.67 rad per weekly fraction) or /sup 60/Co ..gamma.. rays (7, 17.4, 31.9 rad per weekly fraction) either for 60 exposures or for the duration of their lives. The life shortening produced by either the duration-of-life or the fractionated exposures was virtually identical, so the two series were treated as a single experiment. The relative biological effectiveness (RBE) for neutrons increased from 12 at 2.67 rad per weekly fraction to 21 at 0.67 rad per weekly fraction; over the dose ranges studied, the neutron RBE varied inversely with the -0.4 power of the dose. It is predicted that at 0.05 rad of neutrons per week, the RBE will approach 60 if weekly exposures to ..gamma.. radiation are chosen as the reference; if continuous ..gamma.. radiation is used as the reference, the RBE may be approximately twice as large.
Research Organization:
Argonne National Lab., IL
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
6318054
Journal Information:
Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 86:3; ISSN RAREA
Country of Publication:
United States
Language:
English

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Related Subjects

560152* -- Radiation Effects on Animals-- Animals
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
COBALT 60
COBALT ISOTOPES
DELAYED RADIATION EFFECTS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
FISSION NEUTRONS
FRACTIONATED IRRADIATION
GAMMA RADIATION
HADRONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIFE SPAN
MAMMALS
MICE
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
RBE
RODENTS
VERTEBRATES
YEARS LIVING RADIOISOTOPES