A radioactive material which decays through five half-lives will result in
__________ of the original amount.
The roentgen is a unit of x or gamma radiation:
The rad represents an absorption of:
When radiation is absorbed by a living cell, the primary damage is by:
Formation of cell poisons.
Genetic rearrangement within the cell nucleus.
Loss of cell protoplasm and nuclear material.
Ionization and excitation of the atoms and molecules of that cell.