Radioactivity is the spontaneous conversion of certain atomic nuclei into those of lighter elements accompanied by the emission of alpha particles (helium nuclei), beta particles (electrons or positrons), or X and gamma radiation (short wavelength/high frequency electromagnetic waves). Select  me  to convert between different units such as curie, becquerel ... and more.

Radiation Absorbed Dose is the a measure of the energy deposited in a medium by ionising radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name gray (Gy).  Select meto convert between different units such as gray, rad, .. and more.

Radiation Exposure is the exposure to ionizing radiation which occurs during a certain period of time. Select me to convert between different units such as roentgen,rem, sievert .. and more.