Cancer radiotherapy uses high doses of ionizing radiation (l–102Gy; 102–104rad) because only a small fraction of the absorbed dose leads to lethal double-strand breaks in DNA. These breaks are more efficiently produced by Auger electrons (1–10 eV nm−1) generated in proximity to the DNA. The energy of these electrons (on average 21 electrons for the decay of 125I) is dissipated within 10–100 nm of the Auger event and produces multiple double-strand DNA breaks1,2. A single Auger event can be lethal to a cell and is comparable to more than 105 photon absorption events in conventional radiotherapy3,4. We now report that 57Fe(III).bleomycin, administered to malignant cells in vitro and in vivo and irradiated with resonant Mossbauer gamma rays (14.4 keV), causes ablation of the malignant cells, presumably by Auger cascade, with extremely small radiation doses—about 10−5 Gy. As a basis for comparison, about 5 Gy is necessary to achieve a similar effect with conventional radiotherapy5.
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Monte Carlo simulation of dose distribution in water around 57Fe3O4 magnetite nanoparticle in the nuclear gamma resonance condition
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