The Biological Significance of δ-Electrons
A spherical tumor cell of 20 μ diameter irradiated with 30 MeV-electrons with a dose of 200 rads will be hit by 18,300 primary electrons producing altogether. 1.5 million evenly distributed ions in the volume of the cell. With such a dose only a part (for instance 35%) of the tumor cells will be inactivated.
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