ZHOU Guangming, LI Wenjian, WANG Jufang, et al. DOSE—RATE EFFECTS ON THE INDUCTION OF DNA DOUBLE—STRAND BREAKS WITH HEAVY—ION IRRADIATION[J]. Journal of Radiation Research and Radiation Processing, 2001,19(4):289-293.
ZHOU Guangming, LI Wenjian, WANG Jufang, et al. DOSE—RATE EFFECTS ON THE INDUCTION OF DNA DOUBLE—STRAND BREAKS WITH HEAVY—ION IRRADIATION[J]. Journal of Radiation Research and Radiation Processing, 2001,19(4):289-293.DOI:
The deproteinized DNA samples of melanoma cells (B16) were irradiated by 50MeV/u ,12,C,6+,- of different dose rates. And the inverse pulsed—field gel electrophoresis was employed to measure the distribution of DSB fragments. The results show that both of the percentages of DNA released from plug (PR) induced by 3Gy/min and 30Gy/min increase with the rising dose and approach a similar quasi—threshold. The yields of DSB induced with 3Gy/min are 0.40DSBs/(100Mbp.Gy) while those induced with 30Gy/min are not obtained. The cross section of DSB induction with 30Gy/min is 2. 14m,2, which is more than three times of that with 3Gy/min. These show that the higher the dose rate is, the more efficiently DSBs are induced. There is a peak about 860kbp of DSB fragments induced with 3Gy/min, which does not exist in the samples treated with 30Gy/min. It is implied that the dose rate has influence on the distribution of DSB fragments.