Yttrium-99m
Properties and data of the isotope 99Y.
See also: list of Yttrium isotopes.
General data
Name of the isotope:Yttrium-99m; Y-99mSymbol:99Y or 9939YMass number A:99 (= number of nucleons)Atomic number Z:39 (= number of protons)Neutrons N:60Isotopic mass:98.924154(7) u (atomic weight of Yttrium-99m)
Excitation energy: 2141.65(19) keVNuclide mass:98.9027603 u (calculated nuclear mass without electrons)Mass excess:-70.65009 MeVMass defect:0.900917208 u (per nucleus)Nuclear binding energy:839.19897375 MeV (per nucleus)
8.47675731 MeV (average binding energy per nucleon)Half-life:8.0(5) μsDecay constant λ:86643.397569993 s-1Specific activity α:5.324272905612 × 10+26 Bq g-1
1.438992677192 × 10+16 Ci g-1Spin and parity:
(nuclear angular momentum)(17/2+)
Radioactive Decay
Half-life T½ = 8.0(5) μs respectively 8.0 × 10-6 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 99Y | 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 |
---|
99Y | | 1.484(7) s | (5/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 60) and isobaric (same nucleon number A = 99) with Yttrium-99m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 60 | Isobar A = 99 |
34 | 94Se | |
35 | 95Br | |
36 | 96Kr | 99Kr |
37 | 97Rb | 99Rb |
38 | 98Sr | 99Sr |
39 | 99Y | 99Y |
40 | 100Zr | 99Zr |
41 | 101Nb | 99Nb |
42 | 102Mo | 99Mo |
43 | 103Tc | 99Tc |
44 | 104Ru | 99Ru |
45 | 105Rh | 99Rh |
46 | 106Pd | 99Pd |
47 | 107Ag | 99Ag |
48 | 108Cd | 99Cd |
49 | 109In | 99In |
50 | 110Sn | 99Sn |
51 | 111Sb | |
52 | 112Te | |
53 | 113I | |
54 | 114Xe | |
55 | 115Cs | |
56 | 116Ba | |
57 | 117La | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/yttrium-99m
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