The adaptive response occurs at dose values ranging from 0.01 to 0.5 Gy and at dose rate values ranging from 0.01 to 1.0 Gy/min (Aurengo, Averbeck, & Bonnin, 2005). The radioadaptive response appears most beneficial at doses 0.2 Gy of low-LET radiation and is rarely seen at a dose of >0.5 mGy. However, the probability of apoptosis appears to increase in a linear fashion beyond 0.5 mGy (Feinendegen et al., 2007).