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 .

2024年4月17日 · External exposure to large amounts of Cs-137 can cause burns, acute radiation sickness, and even death. Exposure to Cs-137 can increase the risk for cancer because of exposure to high-energy gamma radiation.

2025年2月6日 · The most common radioactive form of cesium (chemical symbol Cs) is Cesium-137. Cesium-137 is produced by nuclear fission for use in medical devices and gauges and is one of the byproducts of nuclear fission in nuclear reactors and nuclear weapons testing.

What is cesium-137? Radioactive cesium-137 is produced spontaneously when other radioactive materials such as uranium and plutonium absorb neutrons and undergo fission. Cesium-137 is therefore a common radionuclide produced when nuclear fission, or splitting, of uranium and plutonium occurs in a reactor or atomic bomb. What are the uses of ...

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 137) with Cesium-137. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Cesium-137 Facts. Some of the important facts about this radioactive substance are as follows: It is only one of the three metals that are liquid at room temperature (83 °F). It is a soft, malleable metal with a silvery-white color; Half-life of Cesium-137 is 30.17 years. Its molecular weight is 136.9071. Its nominal mass is 137 Da, its ...

Cesium-137 is an especially dangerous fission product because of its high yield during fission, moderate half-life, high-energy decay pathway, and chemical reactivity. Because of these properties, cesium-137 is a major contributor to the total …

2009年7月4日 · Cesium Cs 137 is 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 .

2023年8月21日 · Cs-137 (Caesium-137) Radiation Safety Data including half life, decay type and energy, external protection factors and internal (inhalation & ingestion) committed effective dose per unit intake.

Caesium-137, with a half-life of 30.17 years, is one of the two principal medium-lived fission products, along with 90 Sr, which are responsible for most of the radioactivity of spent nuclear fuel after several years of cooling, up to several hundred years after use.