Abstract:
PURPOSE:The LET position of the RBE maximum and its dependence on the cellular repair capacity was determined for carbon ions. Hamster cell lines of differing repair capacity were irradiated with monoenergetic carbon ions. RBE values for cell inactivation at different survival levels were determined and the differences in the RBE-LET patterns were compared with the individual sensitivity to photon irradiation of the different cell lines. MATERIAL AND METHODS:Three hamster cell lines, the wild-type cell lines V79 and CHO-K1 and the radiosensitive CHO mutant xrs5, were irradiated with carbon ions of different energies (2.4-266.4 MeV/u) and LET values (13.7-482.7 keV/microm) and inactivation data were measured in comparison to 250 kV x-rays. RESULTS:For the repair-proficient cell lines a RBE maximum was found at LET values between 150 and 200 keV/microm. For the repair-deficient cell line the RBE failed to show a maximum and decreased continuously for LET values above 100 keV/microm. CONCLUSIONS:The carbon RBE LET relationship for inactivation is shifted to higher LET values compared with protons and alpha-particles. RBE correlated with the repair capacity of the cells.
journal_name
Int J Radiat Bioljournal_title
International journal of radiation biologyauthors
Weyrather WK,Ritter S,Scholz M,Kraft Gdoi
10.1080/095530099139232subject
Has Abstractpub_date
1999-11-01 00:00:00pages
1357-64issue
11eissn
0955-3002issn
1362-3095journal_volume
75pub_type
杂志文章abstract::It is well established from clinical, epidemiological and laboratory studies that specific human germ line mutation can predispose to spontaneously arising cancer. Some of the responsible genes have been characterized at the molecular level and evidence is rapidly accumulating on mechanistic aspects of the problem. A ...
journal_title:International journal of radiation biology
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