What is the decay constant of cesium-137?
What is the decay constant of cesium-137?
Cs decays with a half-life of (30.05 ± 0.08) years [4] to either the 137Ba ground state, with emission of a β particle (Q = 1176 keV, 5.3%), or to 137mBa (Q = 514 keV, 94.7%) which rapidly (t1/2 = 2.552 min) decays to the 137Ba ground state with emission of a 661.7 keV γ photon.
What is the nuclear equation for the decay of uranium-238?
In this reaction, uranium-238 loses two protons and two neutrons to become the element thorium-234. The reaction can be represented by this nuclear equation: 23892U → 23490Th + 42He + Energy.
What is the final product of the decay of U 238?
Uranium-238 decays by alpha emission into thorium-234, which itself decays by beta emission to protactinium-234, which decays by beta emission to uranium-234, and so on.
How long does it take for cesium-137 to decay?
Cesium-137 emits beta particles as it decays to the barium isotope, Ba-137m (half life = 2.6 minutes).
How does Cesium 137 decay in the environment?
Cesium-137 decays in the environment by emitting beta particles. As noted above, cesium-137 decays to a short lived decay product, barium-137m. The latter isotope emits gamma radiation of moderate energy, which further decays to a stable form of barium.
What is the half life of cesium 131?
DECAY PATHWAY: Cesium-131, half-life 9.69 days, decays via electron capture (352 keV) to xenon-131, half-life stable; 1.95% decays via electron capture to xenon -131m which decays via isomeric transition (16.4 keV, gamma emission) to xenon-131 Korea Atomic Energy Research Institute. Nuclear Data Evaluation Lab. 2000.
What is the atomic mass of Cesium Cs 137?
Cesium Cs 137 is a radioactive isotope of cesium with an atomic mass of 139 and potential application in radiotherapy.
What kind of radiation does cesium 134 have?
Radioactive cesium-134 primarily decays to stable barium -134 by beta decay accompanied by gamma ray emissions or less frequently to stable xenon -134 by electron capture (EC) accompanied by a single gamma ray emission. The energy of the various gamma rays are in the range of 0.24-1.4 MeV. ATSDR; Toxicological Profile for Cesium.
