Iodine-108

Properties and data of the isotope ¹⁰⁸I.

Contents

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

General data

Name of the isotope:Iodine-108; I-108Other names:Jod-108Symbol:¹⁰⁸I or 10853IMass number A:108 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:55Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.0377358490566 (= neutron-proton ratio)Neutron excess (N-Z):2Isotopic mass:107.94348(14) u (atomic weight of Iodine-108)Nuclide mass:107.9144071 u (calculated nuclear mass without electrons)Mass excess:-52.64804 MeVMass defect:0.94781707600001 u (per nucleus)Nuclear binding energy:882.88591939 MeV (per nucleus)
8.17486962 MeV (average binding energy per nucleon)Separation energy:S_N = 11.29(33) MeV (first neutron)Half-life:36(6) msDecay constant λ:19.254088348887 s^-1Specific activity α:1.083652637071 × 10⁺²³ Bq g^-1
2928790911004.6 Ci g^-1Spin and parity:
(nuclear angular momentum)(1)Year of discovery:1991

Radioactive Decay

Half-life T_½ = 36(6) ms respectively 3.6 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
α	¹⁰⁴Sb	91(15) %	4.10(5) MeV
EC/β⁺	¹⁰⁸Te	9 %	13.13(13) MeV
p	¹⁰⁷Te	< 1 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 108) with Iodine-108. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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