Iodine-117

Properties and data of the isotope ¹¹⁷I.

Content

General data

Name of the isotope:Iodine-117; I-117Other names:Jod-117Symbol:¹¹⁷I or 11753IMass number A:117 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:64Isotopic mass:116.913648(28) u (atomic weight of Iodine-117)Nuclide mass:116.8845751 u (calculated nuclear mass without electrons)Mass excess:-80.43637 MeVMass defect:1.05563332 u (per nucleus)Nuclear binding energy:983.31610378 MeV (per nucleus)
8.40441114 MeV (average binding energy per nucleon)Separation energy:S_N = 11.02(10) MeV (first neutron)
S_P = 2.46(4) MeV (first proton)Half-life:2.22(4) minDecay constant λ:0.0052038076618615 s^-1Specific activity α:2.701557133426 × 10⁺¹⁹ Bq g^-1
730150576.60176 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)+Magnetic dipole moment:μ(μ_N) = 3.1(2)Nuclear g-factor:g_l = 1.24Year of discovery:1969

Radioactive Decay

Half-life T_½ = 2.22(4) min (minutes) respectively 1.332 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹⁷Te	100 %	4.659(29) MeV

Parent Nuclides

Direct parent isotope is: ¹¹⁷Xe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 117) with Iodine-117. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 64	Isobar A = 117
36	¹⁰⁰Kr
37	¹⁰¹Rb
38	¹⁰²Sr
39	¹⁰³Y
40	¹⁰⁴Zr
41	¹⁰⁵Nb
42	¹⁰⁶Mo	¹¹⁷Mo
43	¹⁰⁷Tc	¹¹⁷Tc
44	¹⁰⁸Ru	¹¹⁷Ru
45	¹⁰⁹Rh	¹¹⁷Rh
46	¹¹⁰Pd	¹¹⁷Pd
47	¹¹¹Ag	¹¹⁷Ag
48	¹¹²Cd	¹¹⁷Cd
49	¹¹³In	¹¹⁷In
50	¹¹⁴Sn	¹¹⁷Sn
51	¹¹⁵Sb	¹¹⁷Sb
52	¹¹⁶Te	¹¹⁷Te
53	¹¹⁷I	¹¹⁷I
54	¹¹⁸Xe	¹¹⁷Xe
55	¹¹⁹Cs	¹¹⁷Cs
56	¹²⁰Ba	¹¹⁷Ba
57	¹²¹La	¹¹⁷La
58	¹²²Ce
59	¹²³Pr
60	¹²⁴Nd