Xenon-133

Properties and data of the isotope ¹³³Xe.

Contents

General Data

Radioactive Decay

Parent Nuclides

Use in Medicine

Isotones und Isobares

See also: List of individual Xenon isotopes (and general data sources).

General data

Name of the isotope:Xenon-133; Xe-133Other names:XeneisolSymbol:¹³³Xe or 13354XeMass number A:133 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.462962962963 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:132.9059107(26) u (atomic weight of Xenon-133)Nuclide mass:132.8762893 u (calculated nuclear mass without electrons)Mass excess:-87.64362 MeVMass defect:1.201169392 u (per nucleus)Nuclear binding energy:1118.88208163 MeV (per nucleus)
8.41264723 MeV (average binding energy per nucleon)Separation energy:S_N = 6.4359(24) MeV (first neutron)
S_P = 9.229(5) MeV (first proton)Half-life:5.2475(5) dDecay constant λ:1.528830264323 × 10^-6 s^-1Specific activity α:6.974872123249 × 10⁺¹⁵ Bq g^-1
188510.05738512 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +0.81335(7)Quadrupole moment Q:0.142(5) barn (100 fm²)Nuclear g-factor:g_l = 0.54223333333333Charge radius:4.7831(47) femtometer fmYear of discovery:1940

Radioactive Decay

Half-life T_½ = 5.2475(5) d respectively 4.53384 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹³³Cs	100 %	0.4274(24) MeV	80.9979(11) keV 36.9 %

Parent Nuclides

Direct parent isotope is: ¹³³I.

Xenon-133 as a Radionuclide in Medicine

The chemically inert noble gas isotope xenon-133 is one of the radiopharmaceuticals approved for medical applications and can be used as a radiodiagnostic for the respiratory tract (ATC code V09EX03).

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
^133mXe	233.221(15) keV	2.198(13) d	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 133) with Xenon-133. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 79	Isobar A = 133
44	¹²³Ru
45	¹²⁴Rh
46	¹²⁵Pd
47	¹²⁶Ag
48	¹²⁷Cd	¹³³Cd
49	¹²⁸In	¹³³In
50	¹²⁹Sn	¹³³Sn
51	¹³⁰Sb	¹³³Sb
52	¹³¹Te	¹³³Te
53	¹³²I	¹³³I
54	¹³³Xe	¹³³Xe
55	¹³⁴Cs	¹³³Cs
56	¹³⁵Ba	¹³³Ba
57	¹³⁶La	¹³³La
58	¹³⁷Ce	¹³³Ce
59	¹³⁸Pr	¹³³Pr
60	¹³⁹Nd	¹³³Nd
61	¹⁴⁰Pm	¹³³Pm
62	¹⁴¹Sm	¹³³Sm
63	¹⁴²Eu	¹³³Eu
64	¹⁴³Gd
65	¹⁴⁴Tb
66	¹⁴⁵Dy
67	¹⁴⁶Ho
68	¹⁴⁷Er
69	¹⁴⁸Tm
70	¹⁴⁹Yb
71	¹⁵⁰Lu