Indium-104m

Properties and data of the isotope ¹⁰⁴In.

Content

General data

Name of the isotope:Indium-104m; In-104mSymbol:¹⁰⁴In or 10449InMass number A:104 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:55Isotopic mass:103.918215(6) u (atomic weight of Indium-104m)
Excitation energy: 93.48(10) keVNuclide mass:103.8913361 u (calculated nuclear mass without electrons)Mass excess:-76.18224 MeVMass defect:0.941781948 u (per nucleus)Nuclear binding energy:877.26423387 MeV (per nucleus)
8.43523302 MeV (average binding energy per nucleon)Half-life:15.7(5) sDecay constant λ:0.044149501946493 s^-1Specific activity α:2.581306015707 × 10⁺²⁰ Bq g^-1
6976502745.1543 Ci g^-1Spin and parity:
(nuclear angular momentum)(3+)

Radioactive Decay

Half-life T_½ = 15.7(5) s respectively 1.57 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁰⁴Cd	20 %
Iso	¹⁰⁴In	80 %

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
¹⁰⁴In		1.80(3) min	(6+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 104) with Indium-104m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 55	Isobar A = 104
30	⁸⁵Zn
31	⁸⁶Ga
32	⁸⁷Ge
33	⁸⁸As
34	⁸⁹Se
35	⁹⁰Br
36	⁹¹Kr
37	⁹²Rb
38	⁹³Sr	¹⁰⁴Sr
39	⁹⁴Y	¹⁰⁴Y
40	⁹⁵Zr	¹⁰⁴Zr
41	⁹⁶Nb	¹⁰⁴Nb
42	⁹⁷Mo	¹⁰⁴Mo
43	⁹⁸Tc	¹⁰⁴Tc
44	⁹⁹Ru	¹⁰⁴Ru
45	¹⁰⁰Rh	¹⁰⁴Rh
46	¹⁰¹Pd	¹⁰⁴Pd
47	¹⁰²Ag	¹⁰⁴Ag
48	¹⁰³Cd	¹⁰⁴Cd
49	¹⁰⁴In	¹⁰⁴In
50	¹⁰⁵Sn	¹⁰⁴Sn
51	¹⁰⁶Sb	¹⁰⁴Sb
52	¹⁰⁷Te
53	¹⁰⁸I
54	¹⁰⁹Xe