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Radiation Protection Dosimetry Advance Access published online on June 2, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm308
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

RADIOBIOLOGICAL INVESTIGATIONS OF SOFT X-RAYS NEAR CARBON, NITROGEN, OXYGEN K-SHELL EDGES ON ASPERGILLUS ORYZAE SPORES

L. Chen, S. P. Jiang*, L. B. Wan, X. D. Ma and M. F. Li

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China

* Corresponding author: spjiang{at}ustc.edu.cn

Received November 13, 2006, amended April 9, 2007, accepted April 23, 2007

Soft X-rays at carbon, nitrogen, oxygen K-shell edges have special radiobiological effects. Using Aspergillus oryzae spores as sample, the radiation effects of soft X-rays near the K-shell edges of C, N and O elements from synchrotron radiation were investigated. Also the dose depositions of different X-ray energies in spore were discussed. At the same time, the spores were irradiated by gamma rays from 60Co and relative biological effects were compared with those produced by soft X-rays. The results showed that soft X-rays near K-shell edges of O element had higher ability of radiation damage than that of X-rays near K-shell edges of C and N elements as compared with one another. But they all had higher killing abilities per unit dose than that of gamma rays from 60Co. The relative biological effects (RBEs), the comparison of dose to gamma rays at 10% survival level, of the three soft X-rays were 1.65, 1.73 and 1.91, respectively.


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