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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The induction of chromosome aberrations in human lymphocytes by in vitro irradiation with beta particles from tritiated water.

The yields of unstable chromosome aberrations induced in human lymphocytes by beta particles from tritiated water ( HTO ) have been measured. HTO was mixed with heparinized blood in various amounts so that doses of 0.25 to 7.0 Gy were delivered in 20 min and 1.5 and 2.5 hr. After culturing for 48 hr, the dicentric yield was measured as a function of dose to the blood and compared with data previously reported for X rays. Using a linear-quadratic dose-effect relation to fit the experimental data, a significant linear contribution was found. The main difference between the coefficients for beta and X radiation is in the alpha values, indicating that HTO beta rays are more efficient, particularly at lower doses, in producing two lesions with a single ionizing track. In accord with the theory of dual radiation, the RBE of HTO beta particles relative to X rays is 2.6 at 0.25 Gy and decreases with increasing dose. When the number of cells without aberrations is plotted against radiation dose, a curve is obtained which is similar in shape to those from human cell survival experiments.[1]


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