Indium-105m

Properties and data of the isotope ¹⁰⁵In.

Content

General data

Name of the isotope:Indium-105m; In-105mSymbol:¹⁰⁵In or 10549InMass number A:105 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:56Isotopic mass:104.914502(11) u (atomic weight of Indium-105m)
Excitation energy: 674.08(25) keVNuclide mass:104.8876231 u (calculated nuclear mass without electrons)Mass excess:-79.64087 MeVMass defect:0.954159864 u (per nucleus)Nuclear binding energy:888.79418836 MeV (per nucleus)
8.46470656 MeV (average binding energy per nucleon)Half-life:48(6) sDecay constant λ:0.014440566261666 s^-1Specific activity α:8.361838858173 × 10⁺¹⁹ Bq g^-1
2259956448.1549 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)

Radioactive Decay

Half-life T_½ = 48(6) s respectively 4.8 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁰⁵In	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
¹⁰⁵In		5.07(7) min	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 56) and isobaric (same nucleon number A = 105) with Indium-105m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 56	Isobar A = 105
31	⁸⁷Ga
32	⁸⁸Ge
33	⁸⁹As
34	⁹⁰Se
35	⁹¹Br
36	⁹²Kr
37	⁹³Rb
38	⁹⁴Sr	¹⁰⁵Sr
39	⁹⁵Y	¹⁰⁵Y
40	⁹⁶Zr	¹⁰⁵Zr
41	⁹⁷Nb	¹⁰⁵Nb
42	⁹⁸Mo	¹⁰⁵Mo
43	⁹⁹Tc	¹⁰⁵Tc
44	¹⁰⁰Ru	¹⁰⁵Ru
45	¹⁰¹Rh	¹⁰⁵Rh
46	¹⁰²Pd	¹⁰⁵Pd
47	¹⁰³Ag	¹⁰⁵Ag
48	¹⁰⁴Cd	¹⁰⁵Cd
49	¹⁰⁵In	¹⁰⁵In
50	¹⁰⁶Sn	¹⁰⁵Sn
51	¹⁰⁷Sb	¹⁰⁵Sb
52	¹⁰⁸Te	¹⁰⁵Te
53	¹⁰⁹I
54	¹¹⁰Xe