Biodosimetry using chromosomal translocations measured by FISH in a population chronically exposed to low dose-rate 60Co γ-irradiation

W. A. Hsieh, J. N. Lucas, J. J. Hwang, C. C. Chan, W. P. Chang

研究成果: 雜誌貢獻文章同行評審

22 引文 斯高帕斯(Scopus)


Purpose: To evaluate the cumulative γ-radiation personal exposure by analysing lymphocyte chromosome translocations using FISH painting and to compare FISH-derived biodoses with those derived from retrospective physical dose reconstruction in residents receiving chronic low dose-rate γ-irradiation while living in radio-contaminated buildings. Materials and methods: Chromosome translocation frequencies were evaluated by scoring 933 to 3077 metaphases under fluorescence microscope for each of the five male and four female exposed individuals after they had relocated from the radioactive environment for 34-82 months. FISH painting was conducted using kits of whole-chromosome probes for chromosomes 1, 2 and 4 in orange and 3, 5 and 6 in green and counter-stained with 4′,6-diamidino-2-phenylindole (DAPI). The retrospective dose estimation termed Taiwan Cumulative Dose (TCD) was conducted by assessment using detailed information of historical exposure and the environmental radioactivity for each apartment during previous residency. Results: A total of 20 244 well-prepared metaphases were scored. Biodoses were calculated from the translocation frequencies and physical doses were estimated from detail questionnaires for each individual. The translocation frequencies measured ranged from 2.2 × 10-3 to 26.8 × 10-3 translocations per cell and the dose equivalent from 52.2 to 992.2 mSv. A good correlation was observed between the physical and biodoses. A plot of TCD against FISH-derived doses produced Dfish = 0.65 DTCD, when fitted by a linear model, and Dfish = 0.53 DTCD + 1.26 × 10-4 DTCD 2, when fitted with a linear-quadratic model. Given the scatter in the data and the extremely small quadratic dose contribution, neither model could be ruled out. Conclusion: Chromosome translocations provide a valid method of dose estimation in extremely protracted low dose-rate γ-radiation exposure. Validation of the TCD method by FISH-measured translocations supports the use of TCD for epidemiological studies.

頁(從 - 到)797-804
期刊International Journal of Radiation Biology
出版狀態已發佈 - 2001

ASJC Scopus subject areas

  • 農業與生物科學(雜項)
  • 放射學、核子醫學和影像學
  • 放射與超音波技術
  • 核能與工程
  • 輻射


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