Effect of low /sup 60/Co dose rates on sister chromatid exchange incidence in the benthic worm. Neanthes arenaceodentata

Technical Report · Tue Oct 13 04:00:00 EDT 1981

DOI:https://doi.org/10.2172/5462809· OSTI ID:5462809

Harrison, F L; Rice, Jr, D W

The usefulness of sister chromatid exchange (SCE) induction as a measure of low-level radiation effect was examined in a benthic marine worm, Neanthes arenaceodentata. Larvae were exposed to /sup 60/Co radiation for 12 to 24 h at total doses ranging from 0.5 to 309 R and at dose rates from 0.04 to 13 R/h. Animals exposed at intermediate dose rates (0.5, 0.6, 1.25, 2.0, and 2.5 R/h) had SCE frequencies per chromosome about twice that of those receiving no radiation (controls), whereas those exposed at the higher dose rates (7.0 and 13 R/h) had SCE frequencies lower than the controls. Animals exposed at the lower dose rates (0.04 and 0.1 R/h) had lower SCE frequencies than those exposed at intermediate dose rates (and higher SCE frequencies than controls). The length of chromosome pair number one differed among metaphase spreads and was used as an index of chromosome condensation in a given metaphase. Because there is a possibility that chromosome morphology may affect the ability to resolve SCEs, morphology will be monitored in future studies. A preliminary experiment was performed to assess the effects of 2.2 and 11.5 R/h for 24 h on growth and development. Larvae observed at 6 and 17 d after irradiation did not have significantly different numbers of abnormal larvae or survival rates.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5462809
• Report Number(s): UCRL-53205; ON: DE82009840
• Country of Publication: United States
• Language: English

Related Subjects

560153* -- Radiation Effects on Animals-- Invertebrates-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
ANNELIDS
AQUATIC ORGANISMS
BENTHOS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CHROMOSOMAL ABERRATIONS
COBALT 60
COBALT ISOTOPES
DATA
DOSE-RESPONSE RELATIONSHIPS
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
GAMMA RADIATION
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
INVERTEBRATES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LARVAE
MINUTES LIVING RADIOISOTOPES
MUTATIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
RADIATION EFFECTS
RADIATIONS
RADIOINDUCTION
RADIOISOTOPES
SISTER CHROMATID EXCHANGES
YEARS LIVING RADIOISOTOPES