Iodine-135

Properties and data of the isotope ¹³⁵I.

Content

General data

Name of the isotope:Iodine-135; I-135Other names:Jod-135Symbol:¹³⁵I or 13553IMass number A:135 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:82Isotopic mass:134.9100594(22) u (atomic weight of Iodine-135)Nuclide mass:134.8809865 u (calculated nuclear mass without electrons)Mass excess:-83.77913 MeVMass defect:1.215190408 u (per nucleus)Nuclear binding energy:1131.94257391 MeV (per nucleus)
8.38475981 MeV (average binding energy per nucleon)Separation energy:S_N = 7.807(5) MeV (first neutron)
S_P = 8.534(3) MeV (first proton)Half-life:6.58(3) hDecay constant λ:2.926153244511 × 10^-5 s^-1Specific activity α:1.315052762403 × 10⁺¹⁷ Bq g^-1
3554196.6551454 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μ_N) = +2.940(2)Nuclear g-factor:g_l = 0.84Year of discovery:1940

Radioactive Decay

Half-life T_½ = 6.58(3) h (hours) respectively 2.3688 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹³⁵Xe	100 %	2.634(4) MeV

Parent Nuclides

Direct parent isotopes are: ¹³⁵Te, ¹³⁶Te, ²⁴⁸Cm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 135) with Iodine-135. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 82	Isobar A = 135
45	¹²⁷Rh
46	¹²⁸Pd
47	¹²⁹Ag
48	¹³⁰Cd
49	¹³¹In	¹³⁵In
50	¹³²Sn	¹³⁵Sn
51	¹³³Sb	¹³⁵Sb
52	¹³⁴Te	¹³⁵Te
53	¹³⁵I	¹³⁵I
54	¹³⁶Xe	¹³⁵Xe
55	¹³⁷Cs	¹³⁵Cs
56	¹³⁸Ba	¹³⁵Ba
57	¹³⁹La	¹³⁵La
58	¹⁴⁰Ce	¹³⁵Ce
59	¹⁴¹Pr	¹³⁵Pr
60	¹⁴²Nd	¹³⁵Nd
61	¹⁴³Pm	¹³⁵Pm
62	¹⁴⁴Sm	¹³⁵Sm
63	¹⁴⁵Eu	¹³⁵Eu
64	¹⁴⁶Gd	¹³⁵Gd
65	¹⁴⁷Tb	¹³⁵Tb
66	¹⁴⁸Dy
67	¹⁴⁹Ho
68	¹⁵⁰Er
69	¹⁵¹Tm
70	¹⁵²Yb
71	¹⁵³Lu
72	¹⁵⁴Hf
73	¹⁵⁵Ta