(Thermal) Neutron Capture Radiohalo Manufacturing Chain: Copyright (c) 1992 by John Brawle

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(Thermal) Neutron Capture Radiohalo Manufacturing Chain: Copyright (c) 1992 ___________________________________________________________ by John Brawley 204 Pb (Stable nonradiogenic 'original' lead) +n | 205 Pb (3 x 10^7 Y)-EC-> 205 Tl [Stable]-n-> 206 Tl (4.19 min) -B--> | +n | _(NonÄCyclic: once only)_______________________| --> 206 Pb (Stable) <---| | +n | *-------------------* L| n =neutron | 207 Pb (Stable) <---| | REQUIREMENTS: | E| a =Alpha Decay | +n | C | 1) Neutron Flux | G| B- =Beta Decay C 208 Pb (Stable) y | 2) Lead particles | E| m =Isomer y +n | c | 3) Geologic time | N| mb =millibarns c 209 Pb (3.3 Hr) l *-------------------* D| EC =Electron Capture l B- | i i 209 Bi (Stable) c---------------------------------------------| c +n | |---------<--B- 207 Tl (4.8 min)----------| | | 210m Bi(3 x 10^6 Y)-n-> 211 Bi (2.15 Min)-a-> (84%) 6.622 MEV -| | | 210 Bi (5 Days) or (16%) 6.278 MEV -| | | B- | | | 210 Po (138 Days) -n-> (30 mb) 211 Po (.52 sec)-a-> 7.445 MEV -|---| | a | (.5 mb) 211m Po (25 sec) or 7.278 MEV -| |_______| 5.30 MEV [Inner Halo]

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