Information about Technetium-99:


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Technetium-99m is the most widely used radioactive isotope for diagnostic studies in nuclear medicine. Different chemical forms are used for brain, bone, liver, spleen and kidney imaging and also for blood flow studies.

Mass-Energy Data:

Atomic Mass:	98.906255	±	0.000002	amu
Excess Mass (Δ):	-87.323307	±	0.001916	MeV
Binding Energy:	852.743069	±	0.001921	MeV
β^- Decay Energy:	0.293651	±	0.001417	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: 211100 years ( 6.65809×10⁺¹² sec., λ = 1.04106×10^-13 s^-1)
Mode of decay:
β^-
to
99
44
Ru
(Q = 0.294 MeV)
Meta state at 0.143 Mev
Spin: 1/2- 211100
Half life: 6.01 h ( 21636 sec., λ = 3.20368×10^-05 s^-1)
Mode of decay: γ (IT) (Q = 0.143 MeV)
Mode of decay:
β^-
to
99
44
Ru
(Q = 0.437 MeV) Branch ratio: 0.0037 %
Possible parent nuclides:
β^- from
99
42
Mo

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	2.1x10*5y	9/2+	+5.6847(4)		[2H]	N	PR 85 479 (52)
				-0.129(6)		AB	Bk82HFS 83 (82)
141	0.205 ns	7/2+	+4.48(15)			IPAC	ZP A347 1 (93)
			3.6(9)		[99Tc]	ME	JP A6 L144 (73)
			+4.4(9)			IPAC	PR 188 605 (69)
181	3.44 ns	5/2+	3.48(4)			NMR/ON	ZP A350 311 (95)
			+3.62(5)			IPAC	ZP A347 1 (93)
			+3.29(6)			TDPAC	ZP 243 166 (71)

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