(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.
In a plan for utilizing nuclear byproducts submitted to a House Armed Services subcommittee in 1983, the department stated, "The measure of success [in the program] will be the degree to which this technology is implemented industrially and the subsequent demand created for cesium 137.
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.
Prefectural governments across the nation would be instructed to use their existing monitoring facilities to measure the quantities of particles of such radioactive substances as cesium 137 and strontium 90, according to the officials at the Ministry of Education, Culture, Sports, Science and Technology.