Iodine-133m2

Properties and data of the isotope ¹³³I.

Content

General data

Name of the isotope:Iodine-133m2; I-133m2Other names:Jod-133m2Symbol:¹³³I or 13353IMass number A:133 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:80Isotopic mass:132.907827(7) u (atomic weight of Iodine-133m2)
Excitation energy: 1729.137(10) keVNuclide mass:132.8787541 u (calculated nuclear mass without electrons)Mass excess:-85.8586 MeVMass defect:1.200092976 u (per nucleus)Nuclear binding energy:1117.87940659 MeV (per nucleus)
8.40510832 MeV (average binding energy per nucleon)Half-life:170 nsDecay constant λ:4077336.356235 s^-1Specific activity α:1.860173778074 × 10⁺²⁸ Bq g^-1
5.027496697499 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(15/2-)

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
¹³³I		20.83(8) h	7/2+
^133m1I	1634.148(10) keV	9(2) s	(19/2-)
^133m3I	2435.00(23) keV	0.78(16) μs	(19/2+)
^133m4I	2493.7(4) keV	469(15) ns	(23/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 133) with Iodine-133m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 133
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd	¹³³Cd
49	¹²⁹In	¹³³In
50	¹³⁰Sn	¹³³Sn
51	¹³¹Sb	¹³³Sb
52	¹³²Te	¹³³Te
53	¹³³I	¹³³I
54	¹³⁴Xe	¹³³Xe
55	¹³⁵Cs	¹³³Cs
56	¹³⁶Ba	¹³³Ba
57	¹³⁷La	¹³³La
58	¹³⁸Ce	¹³³Ce
59	¹³⁹Pr	¹³³Pr
60	¹⁴⁰Nd	¹³³Nd
61	¹⁴¹Pm	¹³³Pm
62	¹⁴²Sm	¹³³Sm
63	¹⁴³Eu	¹³³Eu
64	¹⁴⁴Gd
65	¹⁴⁵Tb
66	¹⁴⁶Dy
67	¹⁴⁷Ho
68	¹⁴⁸Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu