The effects of fast neutrons and X rays on the subependymal layer of the rat brain.

Some effects of irradiation of rat brain with single doses of X rays or fast neutrons have been measured. This was done by estimating the total number of cells in the subependymal layer at various times after irradiation. The gross response to X rays and neutrons was somewhat different, and the results suggest that the two histologically distinguishable cell types in the subependymal layer have different values of RBE.