Technetium-112m

Properties and data of the isotope ^112mTc.

Contents

See also: List of individual Technetium isotopes (and general data sources).

General data

Name of the isotope:Technetium-112m; Tc-112mSymbol:^112mTc or 112m43TcMass number A:112 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:69Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.6046511627907 (= neutron-proton ratio)Neutron excess (N-Z):26Excitation energy:350.0(15) keVIsotopic mass:111.929942(6) u (atomic weight of Technetium-112m)Nuclide mass:111.9063542 u (calculated nuclear mass without electrons)Mass excess:-65.25861 MeVMass defect:1.00441358 u (per nucleus)Nuclear binding energy:935.60522329 MeV (per nucleus)
8.35361807 MeV (average binding energy per nucleon)Half-life:150(17) nsDecay constant λ:4620981.203733 s^-1Specific activity α:2.486215820445 × 10⁺²⁸ Bq g^-1
6.719502217420 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(5+)

Radioactive Decay

Half-life T_½ = 150(17) ns respectively 1.50 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹¹²Tc	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹¹²Tc		271(15) ms	(2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 112) with Technetium-112m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 69	Isobar A = 112
38	¹⁰⁷Sr
39	¹⁰⁸Y
40	¹⁰⁹Zr	¹¹²Zr
41	¹¹⁰Nb	¹¹²Nb
42	¹¹¹Mo	¹¹²Mo
43	¹¹²Tc	¹¹²Tc
44	¹¹³Ru	¹¹²Ru
45	¹¹⁴Rh	¹¹²Rh
46	¹¹⁵Pd	¹¹²Pd
47	¹¹⁶Ag	¹¹²Ag
48	¹¹⁷Cd	¹¹²Cd
49	¹¹⁸In	¹¹²In
50	¹¹⁹Sn	¹¹²Sn
51	¹²⁰Sb	¹¹²Sb
52	¹²¹Te	¹¹²Te
53	¹²²I	¹¹²I
54	¹²³Xe	¹¹²Xe
55	¹²⁴Cs	¹¹²Cs
56	¹²⁵Ba
57	¹²⁶La
58	¹²⁷Ce
59	¹²⁸Pr
60	¹²⁹Nd
61	¹³⁰Pm
62	¹³¹Sm
63	¹³²Eu
64	¹³³Gd