Burak L E, Kodama Y, Nakano M, Ohtaki K, Itoh M, Okladnikova N D, Vasilenko E K, Cologne J B, Nakamura N
Clinical Department, Branch N1, Institute of Biophysics, Ozyorsk's shosse 19, Ozyorsk, Chelyabinsk 456780, Russian Federation.
Int J Radiat Biol. 2001 Aug;77(8):901-8. doi: 10.1080/09553000110063386.
To estimate the translocation-induction rate under chronic exposure conditions by measuring chromosome aberration frequencies in lymphocytes from Mayak nuclear workers using fluorescence in situ hybridization (FISH).
Lymphocytes were examined from 27 nuclear workers at the Mayak Production Association and two control individuals using FISH with probes for chromosomes 1, 2 and 4. Official doses derived from worker film-badge records varied from 0 to 8.50 Gy.
The mean (+/-SD) genome-equivalent translocation frequency (F(G)) was 2.30 (+/-0.75)% in the zero-dose group (n = 7), and Poisson regression analysis provided the best-fit equation of F(G)(%) = 2.96(+/-0.39) + 0.69(+/-0.14)D + 0.12(+/-0.05)A, where D is the film-badge-derived dose (Gy), and A is age centred at 67 years. The induction rate would increase to nearly 1% Gy(-1) if the radiation dose to bone marrow, one of the major organs for lymphocytes and where their precursor cells reside, is considered.
The estimated induction rate in vivo appeared substantially smaller than linear coefficients estimated from various in vitro studies.
