Technetium-112

Properties and data of the isotope ¹¹²Tc.

Contents

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

General data

Name of the isotope:Technetium-112; Tc-112Symbol:¹¹²Tc or 11243TcMass number A:112 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:69Isotopic mass:111.929942(6) u (atomic weight of Technetium-112)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)Separation energy:S_N = 4.306(12) MeV (first neutron)
S_P = 12.608(14) MeV (first proton)Half-life:271(15) msDecay constant λ:2.5577386736529 s^-1Specific activity α:1.387663295103 × 10⁺²² Bq g^-1
375044133811.68 Ci g^-1Spin and parity:
(nuclear angular momentum)(2+)Year of discovery:1990

Radioactive Decay

Half-life T_½ = 271(15) ms respectively 2.71 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹²Ru	98.5 % %	10.372(11) MeV
β^-, n	¹¹¹Ru	1.5(2) %	3.455(11) MeV

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
^112mTc	350.0(15) keV	150(17) ns	(5+)

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-112. 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