Iodine-134m

Properties and data of the isotope ¹³⁴I.

Content

General data

Name of the isotope:Iodine-134m; I-134mOther names:Jod-134mSymbol:¹³⁴I or 13453IMass number A:134 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:81Isotopic mass:133.909776(5) u (atomic weight of Iodine-134m)
Excitation energy: 316.49(22) keVNuclide mass:133.8807031 u (calculated nuclear mass without electrons)Mass excess:-84.04311 MeVMass defect:1.206808892 u (per nucleus)Nuclear binding energy:1124.13524204 MeV (per nucleus)
8.38906897 MeV (average binding energy per nucleon)Half-life:3.52(4) minDecay constant λ:0.0032819468776513 s^-1Specific activity α:1.486041082108 × 10⁺¹⁹ Bq g^-1
401632724.89424 Ci g^-1Spin and parity:
(nuclear angular momentum)(8)-

Radioactive Decay

Half-life T_½ = 3.52(4) min (minutes) respectively 2.112 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹³⁴Xe	2.3 %	~ 4 MeV
Iso	¹³⁴I	97.7 %	0.316 MeV

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
¹³⁴I		52.5(2) min	(4)+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 134) with Iodine-134m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 81	Isobar A = 134
45	¹²⁶Rh
46	¹²⁷Pd
47	¹²⁸Ag
48	¹²⁹Cd	¹³⁴Cd
49	¹³⁰In	¹³⁴In
50	¹³¹Sn	¹³⁴Sn
51	¹³²Sb	¹³⁴Sb
52	¹³³Te	¹³⁴Te
53	¹³⁴I	¹³⁴I
54	¹³⁵Xe	¹³⁴Xe
55	¹³⁶Cs	¹³⁴Cs
56	¹³⁷Ba	¹³⁴Ba
57	¹³⁸La	¹³⁴La
58	¹³⁹Ce	¹³⁴Ce
59	¹⁴⁰Pr	¹³⁴Pr
60	¹⁴¹Nd	¹³⁴Nd
61	¹⁴²Pm	¹³⁴Pm
62	¹⁴³Sm	¹³⁴Sm
63	¹⁴⁴Eu	¹³⁴Eu
64	¹⁴⁵Gd	¹³⁴Gd
65	¹⁴⁶Tb
66	¹⁴⁷Dy
67	¹⁴⁸Ho
68	¹⁴⁹Er
69	¹⁵⁰Tm
70	¹⁵¹Yb
71	¹⁵²Lu
72	¹⁵³Hf