Information about Indium-121:


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Mass-Energy Data:

Atomic Mass:	120.907849	±	0.000029	amu
Excess Mass (Δ):	-85.838233	±	0.027442	MeV
Binding Energy:	1024.132976	±	0.027443	MeV
β^- Decay Energy:	3.364538	±	0.027420	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: 9/2+
Half life: 23.1 s ( 23.1 sec., λ = 0.0300064 s^-1)
Mode of decay:
β^-
to
121
50
Sn
(Q = 3.360 MeV)
Meta state at 0.314 Mev
Spin: 1/2- 23.1
Half life: 3.88 min ( 232.8 sec., λ = 0.00297744 s^-1)
Mode of decay:
β^-
to
121
50
Sn
(Q = 3.674 MeV) Branch ratio: 98.80 %
Mode of decay: γ (IT) (Q = 0.314 MeV) Branch ratio: 1.20 %
Possible parent nuclides:
β^- from
121
48
Cd

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	23.1 s	9/2+	+5.502(5)		[115In]	CFBLS	NP A464 9 (87)
				+0.814(11) st	[115In]	CFBLS	NP A464 9 (87)
314	3.8 m	1/2-	-0.355(4)		[115In]	CFBLS	NP A464 9 (87)

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