Iodine-142

Properties and data of the isotope ¹⁴²I.

Content

General data

Name of the isotope:Iodine-142; I-142Other names:Jod-142Symbol:¹⁴²I or 14253IMass number A:142 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:89Isotopic mass:141.9412(4) u (atomic weight of Iodine-142)Nuclide mass:141.9121271 u (calculated nuclear mass without electrons)Mass excess:-54.77185 MeVMass defect:1.24470422 u (per nucleus)Nuclear binding energy:1159.4345127 MeV (per nucleus)
8.16503178 MeV (average binding energy per nucleon)Separation energy:S_N = 2.91(37) MeV (first neutron)
S_P = 11.57(55) MeV (first proton)Half-life:222(12) msDecay constant λ:3.1222845971169 s^-1Specific activity α:1.333534585010 × 10⁺²² Bq g^-1
360414752705.54 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1975

Radioactive Decay

Half-life T_½ = 222(12) ms respectively 2.22 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴²Xe	75 %	10.46(37) MeV
β^-, n	¹⁴¹Xe	25 %	5.36(37) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴²Te.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 142) with Iodine-142. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 89	Isobar A = 142
50	¹³⁹Sn
51	¹⁴⁰Sb
52	¹⁴¹Te	¹⁴²Te
53	¹⁴²I	¹⁴²I
54	¹⁴³Xe	¹⁴²Xe
55	¹⁴⁴Cs	¹⁴²Cs
56	¹⁴⁵Ba	¹⁴²Ba
57	¹⁴⁶La	¹⁴²La
58	¹⁴⁷Ce	¹⁴²Ce
59	¹⁴⁸Pr	¹⁴²Pr
60	¹⁴⁹Nd	¹⁴²Nd
61	¹⁵⁰Pm	¹⁴²Pm
62	¹⁵¹Sm	¹⁴²Sm
63	¹⁵²Eu	¹⁴²Eu
64	¹⁵³Gd	¹⁴²Gd
65	¹⁵⁴Tb	¹⁴²Tb
66	¹⁵⁵Dy	¹⁴²Dy
67	¹⁵⁶Ho	¹⁴²Ho
68	¹⁵⁷Er
69	¹⁵⁸Tm
70	¹⁵⁹Yb
71	¹⁶⁰Lu
72	¹⁶¹Hf
73	¹⁶²Ta
74	¹⁶³W
75	¹⁶⁴Re
76	¹⁶⁵Os
77	¹⁶⁶Ir
78	¹⁶⁷Pt