Print  ·  PDF Actions Rename  ·  Redirect  ·  Delete  ·  Lock  ·  Permissions Other Notify  ·  RSS  ·  Backlinks  ·  Source CESIUM-137 It has a half-life of about 30.17 years. Cesium-137 is unique in that it is totally anthropogenic . Unlike most other radioisotopes, cesium-137 is not produced from its non-radioactive