Thresholds A and B should be terms in modeling dose-response functions. Regarding whole-body responses, current data
suggest for low-LET acute, non-chronic, irradiation a Threshold B of about 100 mGy prevails, except for leukemia and probably
some other malignancies, and for chronic, low dose-rate irradiation where the Threshold B may well reach 1 Gy per year. A new
Research and Development Program should determine individual Thresholds A and B for various radiogenic cell responses
depending on radiation quality and target