radioactivity present

The radioactivity present on the ground in Area 1 provides a radiologically-contaminated environment for the training of first responders.

Ernest Rutherford, working in Canada and England, showed that radioactive decay can be described by a simple equation ( a linear first degree derivative equation, now called Rate equation, First-order reactions, first order kinetics, implying that a given radioactive substance has a characteristic " half-life " ( the time taken for the amount of radioactivity present in a source to diminish by half ).

The amount of radioactivity present in the hot cell, the energy of the gamma photons emitted by the radioisotopes, and the number of neutrons that are formed by the material will prescribe how thick the shielding must be.