Tellurium-139

Properties and data of the isotope ¹³⁹Te.

Content

General data

Name of the isotope:Tellurium-139; Te-139Symbol:¹³⁹Te or 13952TeMass number A:139 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:87Isotopic mass:138.935367(4) u (atomic weight of Tellurium-139)Nuclide mass:138.9068426 u (calculated nuclear mass without electrons)Mass excess:-60.20525 MeVMass defect:1.225382356 u (per nucleus)Nuclear binding energy:1141.43631232 MeV (per nucleus)
8.21177203 MeV (average binding energy per nucleon)Separation energy:S_N = 2.580(5) MeV (first neutron)
S_P = 13.27(106) MeV (first proton)Half-life:1.6(3) sDecay constant λ:0.43321698784997 s^-1Specific activity α:1.890502698369 × 10⁺²¹ Bq g^-1
51094667523.503 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1994

Radioactive Decay

Half-life T_½ = 1.6(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁹I	100 %	8.266(5) MeV
β^-, n	¹²⁸I	?	3.704(7) MeV

Parent Nuclides

Direct parent isotope is: ²⁴⁸Cm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 139) with Tellurium-139. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 87	Isobar A = 139
49	¹³⁶In
50	¹³⁷Sn	¹³⁹Sn
51	¹³⁸Sb	¹³⁹Sb
52	¹³⁹Te	¹³⁹Te
53	¹⁴⁰I	¹³⁹I
54	¹⁴¹Xe	¹³⁹Xe
55	¹⁴²Cs	¹³⁹Cs
56	¹⁴³Ba	¹³⁹Ba
57	¹⁴⁴La	¹³⁹La
58	¹⁴⁵Ce	¹³⁹Ce
59	¹⁴⁶Pr	¹³⁹Pr
60	¹⁴⁷Nd	¹³⁹Nd
61	¹⁴⁸Pm	¹³⁹Pm
62	¹⁴⁹Sm	¹³⁹Sm
63	¹⁵⁰Eu	¹³⁹Eu
64	¹⁵¹Gd	¹³⁹Gd
65	¹⁵²Tb	¹³⁹Tb
66	¹⁵³Dy	¹³⁹Dy
67	¹⁵⁴Ho
68	¹⁵⁵Er
69	¹⁵⁶Tm
70	¹⁵⁷Yb
71	¹⁵⁸Lu
72	¹⁵⁹Hf
73	¹⁶⁰Ta
74	¹⁶¹W
75	¹⁶²Re
76	¹⁶³Os
77	¹⁶⁴Ir