VI. Herbert Parker's Statement to Congress, 1962 -
MR. PARKER. ...If we accept the principle of acceptable risk in radiation exposure, and there is no alternative today, instead of black and white, we have only infinite gradation of gray from perhaps a black relating to significant over-exposure, grading down but never reaching white. It is beyond our wits to quantify such a scale. Yet the attempt has to be made at least to define bands of gray.