Loss of mouse testis mass after X-irradiation or injection of 22Na

Mass loss in the mouse testis per unit of absorbed dose was used as a means of comparing acute external with protracted internal whole body irradiation. The external and internal sources were X-rays and 22Na respectively. Estimates of the absolute dose to the testis from 22Na were made. The effects of acute and protracted radiation on the integrated loss in mass in the testis per unit of absorbed dose are similar.