Tellurium-109

Properties and data of the isotope ¹⁰⁹Te.

Content

General data

Name of the isotope:Tellurium-109; Te-109Symbol:¹⁰⁹Te or 10952TeMass number A:109 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:57Isotopic mass:108.927305(5) u (atomic weight of Tellurium-109)Nuclide mass:108.8987806 u (calculated nuclear mass without electrons)Mass excess:-67.71496 MeVMass defect:0.973496876 u (per nucleus)Nuclear binding energy:906.80649901 MeV (per nucleus)
8.31932568 MeV (average binding energy per nucleon)Separation energy:S_N = 10.005(7) MeV (first neutron)
S_P = 2.559(7) MeV (first proton)Half-life:4.4(2) sDecay constant λ:0.15753345012726 s^-1Specific activity α:8.784153952020 × 10⁺²⁰ Bq g^-1
23740956627.082 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1967

Radioactive Decay

Half-life T_½ = 4.4(2) s.

Decay mode	Daughter	Probability	Decay energy
α	¹⁰⁵Sn	3.9(13) %	3.198(6) MeV
EE/β⁺	¹⁰⁹Sb	96.1(13) %	8.536(7) MeV
β⁺, p	¹⁰⁸Sb	9.4(31) %
β⁺, α	¹⁰⁵In	< 0.005 %

Parent Nuclides

Direct parent isotope is: ¹¹³Xe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 109) with Tellurium-109. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 57	Isobar A = 109
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se
35	⁹²Br
36	⁹³Kr
37	⁹⁴Rb
38	⁹⁵Sr
39	⁹⁶Y	¹⁰⁹Y
40	⁹⁷Zr	¹⁰⁹Zr
41	⁹⁸Nb	¹⁰⁹Nb
42	⁹⁹Mo	¹⁰⁹Mo
43	¹⁰⁰Tc	¹⁰⁹Tc
44	¹⁰¹Ru	¹⁰⁹Ru
45	¹⁰²Rh	¹⁰⁹Rh
46	¹⁰³Pd	¹⁰⁹Pd
47	¹⁰⁴Ag	¹⁰⁹Ag
48	¹⁰⁵Cd	¹⁰⁹Cd
49	¹⁰⁶In	¹⁰⁹In
50	¹⁰⁷Sn	¹⁰⁹Sn
51	¹⁰⁸Sb	¹⁰⁹Sb
52	¹⁰⁹Te	¹⁰⁹Te
53	¹¹⁰I	¹⁰⁹I
54	¹¹¹Xe	¹⁰⁹Xe
55	¹¹²Cs