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Version: 17.12d (Release date: 2017-12-26)
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Cesium Cs 137 (Code C68812)

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Terms & Properties

Preferred Name: Cesium Cs 137

Definition: A radioactive isotope of cesium with an atomic mass of 139 and potential application in radiotherapy. Cesium Cs 137 is prevalent due to its spontaneous production, which occurs as a result of nuclear fission of other radioactive materials, such as uranium and plutonium. This radionuclide has a relatively long half-life, 30 years, and decays by emitting beta particles. Both Cs 137 and its metastable nuclear isomer, barium-137m, emit gamma radiation of moderate energy and so are used in sterilization procedures in the food industry or in hospital environments.

Label: Cesium Cs 137

NCI Thesaurus Code: C68812 (Search for linked caDSR metadata)  (search value sets)

NCI Metathesaurus Link: C0303379  (see NCI Metathesaurus info)

Synonyms & Abbreviations: (see Synonym Details)
Cesium Cs 137
Cesium, Isotope of Mass 137

External Source Codes: 
CAS Registry Number 10045-97-3 (see NLM ChemIDplus info)
PDQ Closed Trial Search ID 540312
PDQ Open Trial Search ID 540312 (check for NCI PDQ open clinical trial info)
UMLS CUI C0303379

Other Properties:
     Name Value (qualifiers indented underneath)
code C68812
Contributing_Source FDA
Legacy_Concept_Name Cesium-137
Semantic_Type Pharmacologic Substance

Additional Concept Data: 
Defined Fully by Roles: No  


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