It is very unlikely that you could be exposed to large amounts of stable cesium. Cesium irritates the eyes and burns the skin. Pure cesium is highly reactive with water so any contact on or in the body can cause burns. Radioactive cesium is not named as a cancer-causing substance.

Is cesium harmful to humans?

Exposure to large amounts of radioactive cesium can damage cells in your body from the radiation. You might also experience acute radiation syndrome, which includes nausea, vomiting, diarrhea, bleeding, coma, and even death in cases of very high exposures.

Can you touch caesium?

Because of this high reactivity, caesium metal is classified as a hazardous material. It is stored and shipped in dry, saturated hydrocarbons such as mineral oil. It can be handled only under inert gas, such as argon.