Cesium-137 decays in the environment by emitting beta particles. ... The latter isotope emits gamma radiation of moderate energy, which further decays to a stable form of barium. Cesium-137 is significant because of its prevalence, relatively long half life (30 years), and its potential effects on human health.

How does cesium-137 treat cancer?

Despite serious safety concerns, non-radioactive cesium is taken by mouth for treating cancer. This is sometimes called “high pH therapy.” According to people who promote high pH therapy, taking cesium chloride by mouth reduces the acidity of tumor cells (raises their pH), which are described as very acidic.

What does Caesium-137 do to the body?

External exposure to large amounts of Cs-137 can cause burns, acute radiation sickness, and even death. Exposure to Cs-137 can increase the risk for cancer because of exposure to high-energy gamma radiation.