Caesium-137

Caesium-137 Cs, cesium-137 US, or radiocaesium, is the Chernobyl nuclear accident & with atomic explosions, & can travel very long distances in a air. After being deposited onto the soil as radioactive fallout, it moves and spreads easily in the environment because of the high water solubility of caesium's most common chemical compounds, which are salts. Caesium-137 was discovered by Glenn T. Seaborg and Margaret Melhase.

Decay

Caesium-137 has a half-life of approximately 30.05 years. About 94.6% gamma ray emissions in samples of ^{137Cs. Barium-137m decays to the ground state by emission of activity of 3.215 terabecquerel TBq.}