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An Oxygen-Dependent X-Ray Dose-Rate Effect in Serratia marcescens

D. L. Dewey
Radiation Research
Vol. 38, No. 3 (Jun., 1969), pp. 467-474
DOI: 10.2307/3572606
Stable URL: http://www.jstor.org/stable/3572606
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
An Oxygen-Dependent X-Ray Dose-Rate Effect in Serratia marcescens
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Abstract

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.

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