Tellurium-123

Properties and data of the isotope ¹²³Te.

Contents

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

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

General data

Name of the isotope:Tellurium-123; Te-123Symbol:¹²³Te or 12352TeMass number A:123 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:71Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3653846153846 (= neutron-proton ratio)Neutron excess (N-Z):19Isotopic mass:122.90427(1) u (atomic weight of Tellurium-123)Nuclide mass:122.8757456 u (calculated nuclear mass without electrons)Mass excess:-89.17192 MeVMass defect:1.1178407 u (per nucleus)Nuclear binding energy:1041.26190501 MeV (per nucleus)
8.46554394 MeV (average binding energy per nucleon)Separation energy:S_N = 6.92901(8) MeV (first neutron)
S_P = 8.1258(21) MeV (first proton)Half-life:9.2 × 10¹⁶ yearsDecay constant λ:2.389081838009 × 10^-25 s^-1Specific activity α:0.0011706173524853 Bq g^-1
3.163830682392 × 10^-14 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μ_N) = -0.7358(3)Charge radius:4.7117(35) femtometer fmYear of discovery:1932

Radioactive Decay

Half-life T_½ = 9.2 × 10¹⁶ years respectively 2.901312 × 10²⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	¹²³Sb	100 %	0.0519(21) MeV

Parent Nuclides

Direct parent isotope is: ¹²³I.

Occurrence

Comparison of the natural Tellurium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Tellurium Isotopic mixture	127.60 u	100 %
Isotope ¹²⁰Te	119.90406(2) u	0.09(1) %	stable	0+
Isotope ¹²²Te	121.90304(1) u	2.55(12) %	stable	0+
Isotope ¹²³Te	122.90427(1) u	0.89(3) %	9.2 × 10¹⁶ years	1/2+
Isotope ¹²⁴Te	123.90282(1) u	4.74(14) %	stable	0+
Isotope ¹²⁵Te	124.9044312(15) u	7.07(15) %	stable	1/2+
Isotope ¹²⁶Te	125.90331(1) u	18.84(25) %	stable	0+
Isotope ¹²⁸Te	127.904461(6) u	31.74(8) %	7.7(4) × 10²⁴ years	0+
Isotope ¹³⁰Te	129.90622275(8) u	34.08(62) %	0.79 × 10²¹ years	0+

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ¹²³Te

Isotope:¹²³Te-NMRQuantity:0.89(3) %Spin:1/2+Nuclearmagnetic moment
μ/μ_N:-0.7358(3)Gyromagnetic ratio γ:7.0576 · 10⁷ rad T^-1 s^-1
11.23252 MHz T^-1Nuclear g-factor:g_l = -1.4716Resonance frequency:v₀ = 11.2349 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.01837 (H₀ = const.)
0.2639 (v₀ = const.)

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
^123mTe	247.47(4) keV	119.2(1) d	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 123) with Tellurium-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 71	Isobar A = 123
39	¹¹⁰Y
40	¹¹¹Zr
41	¹¹²Nb
42	¹¹³Mo
43	¹¹⁴Tc
44	¹¹⁵Ru	¹²³Ru
45	¹¹⁶Rh	¹²³Rh
46	¹¹⁷Pd	¹²³Pd
47	¹¹⁸Ag	¹²³Ag
48	¹¹⁹Cd	¹²³Cd
49	¹²⁰In	¹²³In
50	¹²¹Sn	¹²³Sn
51	¹²²Sb	¹²³Sb
52	¹²³Te	¹²³Te
53	¹²⁴I	¹²³I
54	¹²⁵Xe	¹²³Xe
55	¹²⁶Cs	¹²³Cs
56	¹²⁷Ba	¹²³Ba
57	¹²⁸La	¹²³La
58	¹²⁹Ce	¹²³Ce
59	¹³⁰Pr	¹²³Pr
60	¹³¹Nd
61	¹³²Pm
62	¹³³Sm
63	¹³⁴Eu
64	¹³⁵Gd
65	¹³⁶Tb