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- W236772235 abstract "It was found that 4 hour ( plus or minus 10 min) old embryos of wild strains of Drosophila which are identical in their phenotype have different radiation sensitivity. The 30-Mevelectrons were significantly less effective biologically than 180-kev-photons for 4 hour ( plus or minus 10 min) old embryos. The RBE was 0.7. The 31-Mev-photons were more effective than 30-Mev-electrons, but less effective than 180-kevphotons. The lesser effectiveness of the megavolt radiation is explained by its smaller ionization density in comparison with 180- kev-photons (100 ionizations/ mu ). The embryos register the difference between 6.3 ionizations/ mu for 31-Mev-photons and 3 ionlzations/ mu for fast electrons. The dependence of the effect of ionization density on the stage of development of the object irradiated can be explained by the fact that the 1 hour old embryos (RBE-1) are damaged by direct effects and the 4 hour old embryos are damaged rather by indirect effects (irradiation products of water). The biological depth dose curve for 4 hour ( plus or minus 10 min) old embryos is in good agreement with the physical curve. (auth)" @default.
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- W236772235 date "1962-08-01" @default.
- W236772235 modified "2023-09-24" @default.
- W236772235 title "BIOLOGICAL EFFECTIVENESS OF 30-Mev ELECTRONS DEPENDING ON TISSUE DEPTH AND IN COMPARISON WITH 180-kev AND 31-Mev PHOTONS" @default.
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