element
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Information about Thorium-221:
 |  |  | | | Wikipedia | Neutron Cross Sections | X-Ray Transitions | X-Ray Attenuation |
Mass-Energy Data:
| Atomic Mass: | 221.018171 | ± | 0.000011 | amu |
| Excess Mass (Δ): | 16.926640 | ± | 0.010429 | MeV |
| Binding Energy: | 1696.423894 | ± | 0.010433 | MeV |
| β- Decay Energy: | -3.439301 | ± | 0.052548 | MeV |
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra,
Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
Radioactive Decay Data:
- Spin: (7/2+)
- Half life: 1.68 ms ( 0.00168 sec., λ = 412.588 s-1)
- Mode of decay:
α to
(Q = 8.628 MeV)
- Possible parent nuclides:
- α from
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)
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