Chromosome aberration frequencies and distributions were analyzed in lymphocytes from human blood samples irradiated with 14.7 MeV neutrons (0.235-2.7 Gy). The exposure was either uniform or simulated partial (1:1 mixed irradiated and unirradiated blood). Unstable aberrations were scored in cells in the first division after phytohaemagglutinin stimulation. The dose effect curve fitted the linear-quadratic equation:
y = 0.0003 + 0.2589(±0.009)D + 0.053(± 0.009)D².
Intercellular distribution was the Neyman's type A or negative binomial distribution. Parameters of these functions significantly decreased in lymphocytes after simulated partial exposure, as compared to homogeneous exposure.