Iodine-122

Properties and data of the isotope ¹²²I.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Iodine-122; I-122Other names:Jod-122Symbol:¹²²I or 12253IMass number A:122 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:69Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3018867924528 (= neutron-proton ratio)Neutron excess (N-Z):16Isotopic mass:121.907589(6) u (atomic weight of Iodine-122)Nuclide mass:121.8785161 u (calculated nuclear mass without electrons)Mass excess:-86.08029 MeVMass defect:1.1050169 u (per nucleus)Nuclear binding energy:1029.31661225 MeV (per nucleus)
8.43702141 MeV (average binding energy per nucleon)Separation energy:S_N = 7.90(7) MeV (first neutron)
S_P = 4.824(26) MeV (first proton)Half-life:3.63(6) minDecay constant λ:0.0031824939419649 s^-1Specific activity α:1.583919570612 × 10⁺¹⁹ Bq g^-1
428086370.43573 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μ_N) = + 0.94(3)Nuclear g-factor:g_l = 0.94Year of discovery:1950

Radioactive Decay

Half-life T_½ = 3.63(6) min (minutes) respectively 2.178 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹²²Te	100 %	4.234(5) MeV

Parent Nuclides

Direct parent isotope is: ¹²²Xe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 122) with Iodine-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 69	Isobar A = 122
38	¹⁰⁷Sr
39	¹⁰⁸Y
40	¹⁰⁹Zr
41	¹¹⁰Nb
42	¹¹¹Mo
43	¹¹²Tc
44	¹¹³Ru	¹²²Ru
45	¹¹⁴Rh	¹²²Rh
46	¹¹⁵Pd	¹²²Pd
47	¹¹⁶Ag	¹²²Ag
48	¹¹⁷Cd	¹²²Cd
49	¹¹⁸In	¹²²In
50	¹¹⁹Sn	¹²²Sn
51	¹²⁰Sb	¹²²Sb
52	¹²¹Te	¹²²Te
53	¹²²I	¹²²I
54	¹²³Xe	¹²²Xe
55	¹²⁴Cs	¹²²Cs
56	¹²⁵Ba	¹²²Ba
57	¹²⁶La	¹²²La
58	¹²⁷Ce	¹²²Ce
59	¹²⁸Pr	¹²²Pr
60	¹²⁹Nd
61	¹³⁰Pm
62	¹³¹Sm
63	¹³²Eu