cesium-137

(redirected from 137 Cs)
Also found in: Medical.

cesium-137

[′sē·zē·əm ‚wən‚thərd·ē′sev·ən]
(nuclear physics)
An isotope of cesium with atomic mass number of 137; emits negative beta particles and has a half-life of 30 years; offers promise as an encapsulated radiation source for therapeutic and other purposes. Also known as radiocesium.
References in periodicals archive ?
This growing site falls into an increased radioactive contamination patch--prior to the accident at the Chernobyl Nuclear Power Plant (ChNPP), the specific activity of 137 Cs in the soil was 12-26 Bq/kg.