element

Information about Polonium-209:


Wikipedia	Neutron Cross Sections	X-Ray Transitions	X-Ray Attenuation

Mass-Energy Data:

Atomic Mass:	208.982416	±	0.000003	amu
Excess Mass (Δ):	-16.379586	±	0.003231	MeV
Binding Energy:	1637.568367	±	0.003243	MeV
β^- Decay Energy:	-3.486479	±	0.007483	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: 1/2-
Half life: 102 years ( 3.21708×10⁺⁰⁹ sec., λ = 2.15458×10^-10 s^-1)
Mode of decay:
α
to
205
82
Pb
(Q = 4.979 MeV) Branch ratio: 99.52 %
Mode of decay:
E.C.
to
209
83
Bi
(Q = 1.893 MeV) Branch ratio: 0.48 %
Possible parent nuclides:
E.C. from
209
85
At

α from
213
86
Rn

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	102 y	1/2-	0.68(8)			O	JOSA 56 1292 (66)
1418	24.4 ns	(13/2)-	6.13(9)			TDPAD	NP A273 253 (76)
1473	98.1 ns	(17/2-)	7.75(5)			TDPAD	NP A273 253 (76)/NIM 114 349 (74)
				(-)0.39(8)	[210Po 1557]	TDPAD	NP A394 245 (83)
4266	118 ns	31/2-	+9.68(8)		[208Po 1528]	TDPAD	PS 14 95 (76)

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