Tellurium-117m

Properties and data of the isotope ¹¹⁷Te.

Content

General data

Name of the isotope:Tellurium-117m; Te-117mSymbol:¹¹⁷Te or 11752TeMass number A:117 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:65Isotopic mass:116.908646(14) u (atomic weight of Tellurium-117m)
Excitation energy: 296.1 keVNuclide mass:116.8801216 u (calculated nuclear mass without electrons)Mass excess:-85.0957 MeVMass defect:1.061475204 u (per nucleus)Nuclear binding energy:988.75778367 MeV (per nucleus)
8.45092123 MeV (average binding energy per nucleon)Half-life:103(3) msDecay constant λ:6.729584277281 s^-1Specific activity α:3.493664176431 × 10⁺²² Bq g^-1
944233561197.62 Ci g^-1Spin and parity:
(nuclear angular momentum)(11/2-)

Radioactive Decay

Half-life T_½ = 103(3) ms respectively 1.03 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹¹⁷Te	100 %

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
¹¹⁷Te		62(2) min	1/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 117) with Tellurium-117m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 65	Isobar A = 117
36	¹⁰¹Kr
37	¹⁰²Rb
38	¹⁰³Sr
39	¹⁰⁴Y
40	¹⁰⁵Zr
41	¹⁰⁶Nb
42	¹⁰⁷Mo	¹¹⁷Mo
43	¹⁰⁸Tc	¹¹⁷Tc
44	¹⁰⁹Ru	¹¹⁷Ru
45	¹¹⁰Rh	¹¹⁷Rh
46	¹¹¹Pd	¹¹⁷Pd
47	¹¹²Ag	¹¹⁷Ag
48	¹¹³Cd	¹¹⁷Cd
49	¹¹⁴In	¹¹⁷In
50	¹¹⁵Sn	¹¹⁷Sn
51	¹¹⁶Sb	¹¹⁷Sb
52	¹¹⁷Te	¹¹⁷Te
53	¹¹⁸I	¹¹⁷I
54	¹¹⁹Xe	¹¹⁷Xe
55	¹²⁰Cs	¹¹⁷Cs
56	¹²¹Ba	¹¹⁷Ba
57	¹²²La	¹¹⁷La
58	¹²³Ce
59	¹²⁴Pr
60	¹²⁵Nd
61	¹²⁶Pm