Information about Tellurium-121:


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Mass-Energy Data:

Atomic Mass:	120.904930	±	0.000027	amu
Excess Mass (Δ):	-88.557294	±	0.025216	MeV
Binding Energy:	1024.504976	±	0.025216	MeV
β^- Decay Energy:	-2.269350	±	0.026086	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: 16.78 days ( 1.44979×10⁺⁰⁶ sec., λ = 4.78101×10^-07 s^-1)
Mode of decay:
E.C.
to
121
51
Sb
(Q = 1.040 MeV)
Meta state at 0.294 Mev
Spin: 11/2- 16.78
Half life: 154 days ( 1.33056×10⁺⁰⁷ sec., λ = 5.20944×10^-08 s^-1)
Mode of decay: γ (IT) (Q = 0.294 MeV) Branch ratio: 88.60 %
Mode of decay:
E.C.
to
121
51
Sb
(Q = 1.334 MeV) Branch ratio: 11.40 %
Possible parent nuclides:
E.C. from
121
53
I

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
294	154 d	11/2-	0.895(10)		[125Te 36]	NMR/ON	PR 36 2097 (87)
443	83.5 ns	7/2+	+0.738(10)			TDPAD	PL 90B 65 (80)
			+0.774(11)			TDPAD	Cf86Bang A4 (86)
			+0.63(7)			TDPAD	ZP A299 251 (81)

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