Demonstration of a biological effect of natural ionizing radiations.

@article{Conter1983DemonstrationOA,
  title={Demonstration of a biological effect of natural ionizing radiations.},
  author={Annie Conter and Dominique Dupouy and Hubert Planel},
  journal={International journal of radiation biology and related studies in physics, chemistry, and medicine},
  year={1983},
  volume={43 4},
  pages={421-32}
}
The blue-green alga, Synechococcus lividus, was grown under various levels of radiations. Shielding of cultures with lead resulted in a lower cell growth rate: the reduction disappeared when a normal radiation level was restored in the lead chamber. Irradiations from a thorium source at a dose-rate 14 times higher than that of natural irradiation stimulated the growth of the algae. These results are a new demonstration of a biological effect of background radiations. 

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