Tellurium-115m

Properties and data of the isotope ¹¹⁵Te.

Content

General data

Name of the isotope:Tellurium-115m; Te-115mSymbol:¹¹⁵Te or 11552TeMass number A:115 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:63Isotopic mass:114.91190(3) u (atomic weight of Tellurium-115m)Nuclide mass:114.8833756 u (calculated nuclear mass without electrons)Mass excess:-82.06462 MeVMass defect:1.040891372 u (per nucleus)Nuclear binding energy:969.58406767 MeV (per nucleus)
8.43116581 MeV (average binding energy per nucleon)Half-life:6.7(4) minDecay constant λ:0.0017242467178108 s^-1Specific activity α:9.108470712228 × 10⁺¹⁸ Bq g^-1
246174884.11428 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2)+

Radioactive Decay

Half-life T_½ = 6.7(4) min (minutes) respectively 4.02 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹⁵Sb	< 100 %
Iso	¹¹⁵Te	?

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
¹¹⁵Te		5.8(2) min	7/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 63) and isobaric (same nucleon number A = 115) with Tellurium-115m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 63	Isobar A = 115
35	⁹⁸Br
36	⁹⁹Kr
37	¹⁰⁰Rb
38	¹⁰¹Sr
39	¹⁰²Y
40	¹⁰³Zr
41	¹⁰⁴Nb	¹¹⁵Nb
42	¹⁰⁵Mo	¹¹⁵Mo
43	¹⁰⁶Tc	¹¹⁵Tc
44	¹⁰⁷Ru	¹¹⁵Ru
45	¹⁰⁸Rh	¹¹⁵Rh
46	¹⁰⁹Pd	¹¹⁵Pd
47	¹¹⁰Ag	¹¹⁵Ag
48	¹¹¹Cd	¹¹⁵Cd
49	¹¹²In	¹¹⁵In
50	¹¹³Sn	¹¹⁵Sn
51	¹¹⁴Sb	¹¹⁵Sb
52	¹¹⁵Te	¹¹⁵Te
53	¹¹⁶I	¹¹⁵I
54	¹¹⁷Xe	¹¹⁵Xe
55	¹¹⁸Cs	¹¹⁵Cs
56	¹¹⁹Ba	¹¹⁵Ba
57	¹²⁰La
58	¹²¹Ce
59	¹²²Pr