Safety related
Scattered radiation
Scintillation detector
Secondary radiation
Shielding
Sievert (Sv)
Somatic effects of radiation
Source material
Specific Activity of a Radionuclide
Spent fuel pool
Spent nuclear fuel
Stable isotope
Stadia board
Strong Tight Container (STC)
Stochastic effects
Subcriticality
Subcritical mass
Supercriticality
Surface Contaminated Object (SCO)
Survey meter