Information about Thorium-229:


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Thorium-229 helps fluorescent lights to last longer.

Mass-Energy Data:

Atomic Mass:	229.031755	±	0.000003	amu
Excess Mass (Δ):	29.579904	±	0.002925	MeV
Binding Energy:	1748.341213	±	0.002941	MeV
β^- Decay Energy:	-0.310431	±	0.008827	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: 5/2+
Half life: 7340 years ( 2.31504×10⁺¹¹ sec., λ = 2.99411×10^-12 s^-1)
Mode of decay:
α
to
225
88
Ra
(Q = 5.168 MeV)
Possible parent nuclides:
β^- from
229
89
Ac

E.C. from
229
91
Pa

α from
233
92
U

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)

Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)	T_1/2	Spin	m(nm)	Q(b)	Ref. Std.	Method	Reference
0	7340 y	5/2+	+0.46(4)		[239Pu]	O	JPPa 35 483 (74)
				+4.3(9)		O	JPPa 35 483 (74)

N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published. 2000 Courtesy of T. Burrows at BNL/NNDC.