ABSTRACT
The fact that the human body is unable to sense ionizing radiation is probably responsible for much of the general apprehension about this type of hazard. Reliance must be placed on detection devices which are based on the physical or chemical effects of radiation. These effects include:
⦁ ionization in gases;
⦁ ionization and excitation in certain solids;
⦁ changes in chemical systems; and
⦁ activation by neutrons.
