Iodine-140

Properties and data of the isotope ¹⁴⁰I.

Content

General data

Name of the isotope:Iodine-140; I-140Other names:Jod-140Symbol:¹⁴⁰I or 14053IMass number A:140 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:87Isotopic mass:139.931716(13) u (atomic weight of Iodine-140)Nuclide mass:139.9026431 u (calculated nuclear mass without electrons)Mass excess:-63.60614 MeVMass defect:1.236858388 u (per nucleus)Nuclear binding energy:1152.12616727 MeV (per nucleus)
8.22947262 MeV (average binding energy per nucleon)Separation energy:S_N = 3.207(13) MeV (first neutron)
S_P = 10.690(13) MeV (first proton)Half-life:0.86(4) sDecay constant λ:0.80598509367436 s^-1Specific activity α:3.491910622385 × 10⁺²¹ Bq g^-1
94375962767.184 Ci g^-1Spin and parity:
(nuclear angular momentum)(4-)Year of discovery:1972

Radioactive Decay

Half-life T_½ = 0.86(4) s respectively 8.6 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁰Xe	92.40 %	9.380(12) MeV
β^-, n	¹³⁹Xe	7.60(28) %	3.967(13) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁰Te.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 140) with Iodine-140. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 87	Isobar A = 140
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb	¹⁴⁰Sb
52	¹³⁹Te	¹⁴⁰Te
53	¹⁴⁰I	¹⁴⁰I
54	¹⁴¹Xe	¹⁴⁰Xe
55	¹⁴²Cs	¹⁴⁰Cs
56	¹⁴³Ba	¹⁴⁰Ba
57	¹⁴⁴La	¹⁴⁰La
58	¹⁴⁵Ce	¹⁴⁰Ce
59	¹⁴⁶Pr	¹⁴⁰Pr
60	¹⁴⁷Nd	¹⁴⁰Nd
61	¹⁴⁸Pm	¹⁴⁰Pm
62	¹⁴⁹Sm	¹⁴⁰Sm
63	¹⁵⁰Eu	¹⁴⁰Eu
64	¹⁵¹Gd	¹⁴⁰Gd
65	¹⁵²Tb	¹⁴⁰Tb
66	¹⁵³Dy	¹⁴⁰Dy
67	¹⁵⁴Ho	¹⁴⁰Ho
68	¹⁵⁵Er
69	¹⁵⁶Tm
70	¹⁵⁷Yb
71	¹⁵⁸Lu
72	¹⁵⁹Hf
73	¹⁶⁰Ta
74	¹⁶¹W
75	¹⁶²Re
76	¹⁶³Os
77	¹⁶⁴Ir