Radioactive Series in Nature Number of erles Series Parent Half-life Stable decays yp Name ucleus (10· years) Nucleus 4=4m Thorium 232Th 14.05 208 Pb 6 4 A=4n+2 Uranium 238 U 4.47 206Pb A=4n+3 Actinium 235 U 0.704 207 Pb 7 64
Radioactive Series in Nature
PROPERTI hRObEBII 事8 F RADIOISOTO8R Have different penetrating ability with materials of different thickness and densities Kill cells Cause cell mutation Ionise molecules Have the same chemical properties as non-radioactive isotopes of the same element Its activity decreases with time
Have different penetrating ability with materials of different thickness and densities Kill cells Cause cell mutation Ionise molecules Have the same chemical properties as non-radioactive isotopes of the same element Its activity decreases with time
2. Production of Radioisotopes 27+2He→P+0n P≥30Si+0e+v 30 15
Al He P n 1 0 3 0 1 5 4 2 2 7 1 3 + → + P→ Si+ e + 0 1 3 0 1 4 3 0 1 5 2. Production of Radioisotopes
Produce Select suitable nuclides Radioactive nuclei Nuclear reactor accelerator generator
Produce Select suitable nuclides Radioactive nuclei Nuclear reactor accelerator generator
2. 1 Nuclear Reactor Irradiation Neutron flux: 1010x1013cm-2 s -1 (n,a),(n,p),(n,f),(n,v) (n,a)、(n,p): En high,σSmal, Light nuclides 32S(n, p 2P, Li(n, a H Parent and daughter is different Chemical separation
2.1 Nuclear Reactor Irradiation Neutron flux: 1010~1013cm-2·s-1 ， (n,α), (n,p), (n,f), (n,γ) (n,α)、(n,p): En High, σ Small，Light nuclides 32S(n,p) 32P, 6Li(n,α) 3H 。 Parent and daughter is different Chemical separation