(redirected from cesium 137)
Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.
Related to cesium 137: Chernobyl, cobalt 60, strontium 90, iodine 131

cesium-137 (137Cs)

a radioactive material with a half-life of 30.2 years that is used in radiotherapy as a sealed source of gamma rays intended for application to various malignancies that are treated by brachytherapy. Cesium has replaced radium for such applications. See also brachytherapy.


a chemical element, atomic number 55, atomic weight 132.905, symbol Cs. See Table 6.

a product of atomic fission by explosion or breakdown of a reactor. It is feared as a pollutant because of its very long half-life.
References in periodicals archive ?
Leaving the container sealed, four experts from the Japan Atomic Energy Research Institute in Tokyo measured gamma rays and detected cesium 137 in one section of the 6-meter-long, 2.
The half-life of Iodine 131 is eight days, and for Cesium 137, 30 years, though both are removed from the atmosphere fairly quickly.
According to the study published Monday, cesium 134 and cesium 137 found in 15 bluefin tuna caught off the coast of San Diego, California, last August measured 4 bequerels per kilogram and 6.
The spectrometer, developed over 10 years by Hamby and Abi Farsoni, an assistant professor in the College of Engineering, can quickly tell the type and amount of radionuclides that are present in something like a soil sample-contaminants such as cesium 137 or strontium 90-that were produced from reactor operations.
One container is holding cesium 137 while the other two hold cobalt 57.