Radiation and Environmental Biophysics

, Volume 49, Issue 2, pp 281–291 | Cite as

Early hematopoiesis inhibition under chronic radiation exposure in humans

  • Alexander V. Akleyev
  • Igor V. Akushevich
  • Georgy P. Dimov
  • Galina A. Veremeyeva
  • Tatyana A. Varfolomeyeva
  • Svetlana V. Ukraintseva
  • Anatoly I. Yashin
Original Paper

Abstract

The major goal of this study was to identify and quantitatively describe the association between the characteristics of chronic (low-dose rate) exposure to (low LET) ionizing radiation and cellularity of peripheral blood cell lines. About 3,200 hemograms (i.e., spectra of blood counts) obtained over the years of maximal exposure to ionizing radiation (1950–1956) for inhabitants of the Techa River were used in analyses. The mean cumulative red bone marrow dose (with standard errors), calculated using Techa River Dosimetry System-2000, was 333.6 ± 4.6 mGy (SD = 259.9 mGy, max = 1151 mGy) to the year 1956. The statistical approach included both empirical methods for estimating frequencies of cytopenic states of the investigated blood cell lines (e.g. neutrophile, platelets, erythrocyte, etc.), and regression methods, including generalized linear models and logistic regressions which allowed taking into account confounding factors (e.g., attained age, age at maximal exposure, presence of concomitant diseases, and demographic characteristics). The results of the analyses demonstrated hematopoiesis inhibition manifested by a decrease in peripheral blood cellularity and an increase in the frequency of cytopenia in all blood cell lines (leukocytes, including lymphocytes, monocytes, neutrophiles, as well as platelets and erythrocytes). The intensity of hematopoiesis inhibition in the period of maximal exposures is determined by the combined influence of the dose rate and cumulative dose. The contribution of specific confounding factors was quantified and shown to be much less important than dose characteristics. The best predictor among dose characteristics was identified for each blood cell line. A 2-fold increase in dose rate is assumed to be a characteristic of radiosensitivity and a quantitative characteristic of the effect.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Alexander V. Akleyev
    • 1
  • Igor V. Akushevich
    • 2
  • Georgy P. Dimov
    • 1
  • Galina A. Veremeyeva
    • 1
  • Tatyana A. Varfolomeyeva
    • 1
  • Svetlana V. Ukraintseva
    • 2
  • Anatoly I. Yashin
    • 2
  1. 1.Clinical DepartmentUrals Research Center for Radiation MedicineChelyabinskRussia
  2. 2.Center for Population Health and AgingDuke UniversityDurhamUSA

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