Iodine-120

Properties and data of the isotope ¹²⁰I.

Content

General data

Name of the isotope:Iodine-120; I-120Other names:Jod-120Symbol:¹²⁰I or 12053IMass number A:120 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:67Isotopic mass:119.910087(16) u (atomic weight of Iodine-120)Nuclide mass:119.8810141 u (calculated nuclear mass without electrons)Mass excess:-83.75342 MeVMass defect:1.085189068 u (per nucleus)Nuclear binding energy:1010.84710571 MeV (per nucleus)
8.42372588 MeV (average binding energy per nucleon)Separation energy:S_N = 8.06(3) MeV (first neutron)
S_P = 3.861(17) MeV (first proton)Half-life:81.6(2) minDecay constant λ:0.00014157417903594 s^-1Specific activity α:7.16453485953 × 10⁺¹⁷ Bq g^-1
19363607.728465 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = 1.23Nuclear g-factor:g_l = 0.615Year of discovery:1957

Radioactive Decay

Half-life T_½ = 81.6(2) min (minutes) respectively 4.896 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹²⁰Te	100 %	5.615(16) MeV

Parent Nuclides

Direct parent isotope is: ¹²⁰Xe.

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
^120m1I	72.61(9) keV	228(15) ns	1+,2+,3+
^120m2I	320 keV	53(4) min	(7-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 120) with Iodine-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 67	Isobar A = 120
38	¹⁰⁵Sr
39	¹⁰⁶Y
40	¹⁰⁷Zr
41	¹⁰⁸Nb
42	¹⁰⁹Mo
43	¹¹⁰Tc	¹²⁰Tc
44	¹¹¹Ru	¹²⁰Ru
45	¹¹²Rh	¹²⁰Rh
46	¹¹³Pd	¹²⁰Pd
47	¹¹⁴Ag	¹²⁰Ag
48	¹¹⁵Cd	¹²⁰Cd
49	¹¹⁶In	¹²⁰In
50	¹¹⁷Sn	¹²⁰Sn
51	¹¹⁸Sb	¹²⁰Sb
52	¹¹⁹Te	¹²⁰Te
53	¹²⁰I	¹²⁰I
54	¹²¹Xe	¹²⁰Xe
55	¹²²Cs	¹²⁰Cs
56	¹²³Ba	¹²⁰Ba
57	¹²⁴La	¹²⁰La
58	¹²⁵Ce	¹²⁰Ce
59	¹²⁶Pr
60	¹²⁷Nd
61	¹²⁸Pm
62	¹²⁹Sm
63	¹³⁰Eu