Iodine-116m

Properties and data of the isotope ¹¹⁶I.

Content

General data

Name of the isotope:Iodine-116m; I-116mOther names:Jod-116mSymbol:¹¹⁶I or 11653IMass number A:116 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:63Isotopic mass:115.91681(10) u (atomic weight of Iodine-116m)
Excitation energy: 430.4(5) keVNuclide mass:115.8877371 u (calculated nuclear mass without electrons)Mass excess:-77.49099 MeVMass defect:1.043806404 u (per nucleus)Nuclear binding energy:972.29940249 MeV (per nucleus)
8.3818914 MeV (average binding energy per nucleon)Half-life:3.27 μsDecay constant λ:211971.61485014 s^-1Specific activity α:1.110019932987 × 10⁺²⁷ Bq g^-1
3.000053872939 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(7-)

Radioactive Decay

Half-life T_½ = 3.27 μs respectively 3.27 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹¹⁶I	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
¹¹⁶I		2.91(15) s	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 63) and isobaric (same nucleon number A = 116) with Iodine-116m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 63	Isobar A = 116
35	⁹⁸Br
36	⁹⁹Kr
37	¹⁰⁰Rb
38	¹⁰¹Sr
39	¹⁰²Y
40	¹⁰³Zr
41	¹⁰⁴Nb
42	¹⁰⁵Mo	¹¹⁶Mo
43	¹⁰⁶Tc	¹¹⁶Tc
44	¹⁰⁷Ru	¹¹⁶Ru
45	¹⁰⁸Rh	¹¹⁶Rh
46	¹⁰⁹Pd	¹¹⁶Pd
47	¹¹⁰Ag	¹¹⁶Ag
48	¹¹¹Cd	¹¹⁶Cd
49	¹¹²In	¹¹⁶In
50	¹¹³Sn	¹¹⁶Sn
51	¹¹⁴Sb	¹¹⁶Sb
52	¹¹⁵Te	¹¹⁶Te
53	¹¹⁶I	¹¹⁶I
54	¹¹⁷Xe	¹¹⁶Xe
55	¹¹⁸Cs	¹¹⁶Cs
56	¹¹⁹Ba	¹¹⁶Ba
57	¹²⁰La	¹¹⁶La
58	¹²¹Ce
59	¹²²Pr