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Figure 14. Tissue response to radiation of a given quality derives from all cellular response probabilities per microdose event of size 
. In this simplified scheme: pspo is the probability of spontaneous cancer developing from an exposed micromass; pind is the probability of radiation-induced cancer, which is taken to be constant per microdose event in the low dose range; pprot is the probability of low dose specific protection against cancer, which changes with NH and tp; papo is the probability of radiation-induced apoptosis, which is taken to be constant per microdose event in the low dose range; tp is the time of duration of protection; NH is the number of microdose events in exposed micromasses; and NE is the number of exposed micromasses (see also Figure 13).
