Relative Biological Effectiveness of HZE Fe Ions for Induction of Micro-Nuclei at Low Doses

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Dose-response curves for induction of micro-nuclei (MN) was measured in Chinese hamster V79 and xrs6 (Ku80-) cells and in human mammary epithelial MCF10A cells in the dose range of 0.05-1 Gy. The Chinese Hamster cells were exposed to 1 GeV/u Fe ions, 600 MeV/u Fe ions, and 300 MeV/u Fe ions (LETs of 151, 176 and 235 keV/{micro}m respectively) as well as with 320 kVp X-rays as reference. Second-order polynomials were fitted to the induction curves and the initial slopes (the alpha values) were used to calculate RBE. For the repair proficient V79 cells the RBE at these low doses ... continued below

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Groesser, Torsten; Chun, Eugene & Rydberg, Bjorn January 16, 2007.

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Dose-response curves for induction of micro-nuclei (MN) was measured in Chinese hamster V79 and xrs6 (Ku80-) cells and in human mammary epithelial MCF10A cells in the dose range of 0.05-1 Gy. The Chinese Hamster cells were exposed to 1 GeV/u Fe ions, 600 MeV/u Fe ions, and 300 MeV/u Fe ions (LETs of 151, 176 and 235 keV/{micro}m respectively) as well as with 320 kVp X-rays as reference. Second-order polynomials were fitted to the induction curves and the initial slopes (the alpha values) were used to calculate RBE. For the repair proficient V79 cells the RBE at these low doses increased with LET. The values obtained were 3.1 (LET=151 keV/{micro}m), 4.3 (LET = 176 keV/{micro}m) and 5.7 (LET = 235 keV/{micro}m), while the RBE was close to 1 for the repair deficient xrs6 cells regardless of LET. For the MCF10A cells the RBE was determined for 1 GeV/u Fe ions and found to be 5.4, slightly higher than for V79 cells. To test the effect of shielding, the 1 GeV/u Fe ion beam was intercepted by various thickness of high-density polyethylene plastic absorbers, which resulted in energy loss and fragmentation. It was found that the MN yield for V79 cells placed behind the absorbers decreased in proportion to the decrease in dose both before and after the Fe ion Bragg peak (excluding the area around the Fe-ion Bragg peak itself), indicating that RBE did not change significantly due to shielding. At the Bragg peak the effectiveness for MN formation per unit dose was decreased, indicating an 'overkill' effect by low-energy very high-LET Fe ions.

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  • Journal Name: Radiation Research; Journal Volume: 168; Journal Issue: 6; Related Information: Journal Publication Date: 12/2007

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  • Report No.: LBNL--62304
  • Grant Number: DE-AC02-05CH11231
  • Grant Number: NASA:T6275W
  • DOI: 10.1667/RR0967.1 | External Link
  • Office of Scientific & Technical Information Report Number: 922854
  • Archival Resource Key: ark:/67531/metadc899670

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 16, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 3, 2017, 2:02 p.m.

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Groesser, Torsten; Chun, Eugene & Rydberg, Bjorn. Relative Biological Effectiveness of HZE Fe Ions for Induction of Micro-Nuclei at Low Doses, article, January 16, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899670/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.