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Caesium-137 (137 55 Cs), cesium-137 (US), [7] or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from spontaneous fission of uranium-238. It is ...
The radiation source in the Goiânia accident was a small capsule containing about 93 grams (3.3 oz) of highly radioactive caesium chloride (a caesium salt made with a radioisotope, caesium-137) encased in a shielding canister made of lead and steel. The source was positioned in a container of the wheel type, where the wheel turns inside the ...
The Kramatorsk radiological accident was a radiation accident that happened in Kramatorsk, Donetsk Oblast, in eastern Ukrainian SSR from 1980 to 1989. A small capsule containing highly radioactive caesium-137 was found inside the concrete wall of an apartment building, with a surface gamma radiation exposure dose rate of 1800 R/year. [1]
Medically useful photon beams can also be derived from a radioactive source such as iridium-192, caesium-137, or cobalt-60. ( Radium-226 has also been used as such a source in the past, though has been replaced in this capacity by less harmful radioisotopes.)
A measurable Caesium-137 trace was detected on two residents, at 0,12 mSv and 0,5 mSv each. [96] May 2021 – In Mumbai, Maharashtra Anti Terrorism Squad arrested two people on 5 May with 7.1 kg of natural uranium estimated worth ₹ 21.3 crore (US$2.5 million). It was unclear how they acquired the material.
Caesium-137, with a half-life of 30.17 years, ... 137 Cs has been used as a tracer in hydrologic studies, analogous to the use of 3 H. Other isotopes of caesium
Caesium chloride composed of radioisotopes such as 137 CsCl and 131 CsCl, [43] is used in nuclear medicine, including treatment of cancer (brachytherapy) and diagnosis of myocardial infarction. [ 44 ] [ 45 ] In the production of radioactive sources, it is normal to choose a chemical form of the radioisotope which would not be readily dispersed ...
One example is the radiological accident occurring in Goiânia, Brazil, between September 1987 and March 1988: Two metal scavengers broke into an abandoned radiotherapy clinic and removed a teletherapy source capsule containing powdered cesium-137 with an activity of 50 TBq. They brought it back to the home of one of the men to take it apart ...