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Two years after this Pierre and Marie Currie discovered other elements: Polonium and Radium which had this property.

The elements with atomic number greater than 82 are radioactive.

The is a measure of how quickly on average a radioactive nuclei will take to decay.

RADIOACTIVE ELEMENTS IN THE HUMAN BODY Rb) are termed primordial radioisotopes, for they were present when the earth was formed.

The fact that they are still present in our environment is due to the fact that their half lives are comparable to the age of the earth, and thus they have not yet decayed into stable elements.