Nuclear Energy Radioactivity 5CS82→>56Ba81+B(e)+V712=30 antineutrino(反中微子) 239 94u 145 →>232U13+4Hfe2(a) 1/2 24,000y 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan University
Nuclear Energy Radioactivity Cs Ba (e) T 30yr 81 1/ 2 137 82 56 137 55 → + + = − β ν Pu U He ( ) T 24,000yr 2 1/ 2 4 143 2 235 145 92 239 94 → + α = antineutrino(反中微子)
Some types of radioactive nuclei decay very soon after they are formed; others have a low probability for decay and are likely to survive for billions of years after their formation Beta-decaying 137 55 CSx2>5Ba&1+B(e)+v Tr=30yr antineutrino(反中微子) The energetic electron is responsible for much of the damage to living things that can be done by this radioactivity Some beta-decaying radioactive nuclei emit positive rather than Negative beta particles (proton -> neutron) 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan University
Some types of radioactive nuclei decay very soon after they are formed; others have a low probability for decay and are likely to survive for billions of years after their formation. Cs Ba (e) T 30yr 81 1/ 2 137 82 56 137 55 → + + = − ∗ β ν antineutrino(反中微子) Some beta-decaying radioactive nuclei emit positive rather than Negative beta particles. (proton -> neutron) Beta-decaying The energetic electron is responsible for much of the damage to living things that can be done by this radioactivity