Calibration (dose-response) curves for young adult males; blood samples were exposed in vitro (137Cs γ rays). The linear equations were y = 0.4037x + 0.3162 for inversions (blue) and y = 0.1281x + 0.022 for translocations (red). R-squared values were 0.9098 and 0.9091 for inversions and translocations, respectively. Error bars represent the standard deviation.