Cesium-137 (137Cs) - Washington State Department of Health
https://doh.wa.gov/sites/default/files/legacy/Documents/Pubs//320-077_cs137_fs.pdf
WEBCesium-137, was used in intracavitary brachytherapy radiation therapy for the treatment of cancer, and now, as a sealed source, is used in the treatment of cancer. It is also used as a radiotracer for the identification of sources of soil erosion and deposition, in density and fill height level switches, in atomic clocks and in food irradiation.
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