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An Oxygen-Dependent X-Ray Dose-Rate Effect in Serratia marcescens
D. L. Dewey
Vol. 38, No. 3 (Jun., 1969), pp. 467-474
Published by: Radiation Research Society
Stable URL: http://www.jstor.org/stable/3572606
Page Count: 8
You can always find the topics here!Topics: Oxygen, Radiation dosage, Irradiation, Serratia marcescens, Bacteria, Radiotherapy, Radiation damage, Dosimetry, Oxygen partial pressure, Serratia
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Anoxic bacteria were found to be independent of x-ray dose rate between 167 and 2130 rads/min. Fully aerobic bacteria were less sensitive to radiation at low dose rates. Aerobic bacteria at very low oxygen tensions were more sensitive to radiation at low dose rates. A possible explanation for the observed phenomenon is to assume repair of radiation damage. Repair of radiation damage in Serratia was demonstrated by preliminary UV treatment. At the lowest oxygen tension a change in the observed K value with dose rate demonstrated oxygen depletion by radiation. Measurements of K values at conventional dose rates are liable to be in error unless gas equilibration is very efficient.
Radiation Research © 1969 Radiation Research Society