Silver-99m
Properties and data of the isotope 99Ag.
See also: list of Silver isotopes.
General data
Name of the isotope:Silver-99m; Ag-99mSymbol:99Ag or 9947AgMass number A:99 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:52Isotopic mass:98.917646(7) u (atomic weight of Silver-99m)
Excitation energy: 506.2(4) keVNuclide mass:98.8918641 u (calculated nuclear mass without electrons)Mass excess:-76.71226 MeVMass defect:0.900706136 u (per nucleus)Nuclear binding energy:839.00236145 MeV (per nucleus)
8.47477133 MeV (average binding energy per nucleon)Half-life:10.5(5) sDecay constant λ:0.066014017196185 s-1Specific activity α:4.056588880466 × 10+20 Bq g-1
10963753730.991 Ci g-1Spin and parity:
(nuclear angular momentum)(1/2-)
Radioactive Decay
Half-life T½ = 10.5(5) s respectively 1.05 × 101 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 99Ag | 100 % | | |
Parent Nuclides
Direct parent isotopes are: 99Cd, 100In.
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 |
---|
99Ag | | 124(3) s | (9/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 52) and isobaric (same nucleon number A = 99) with Silver-99m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 52 | Isobar A = 99 |
28 | 80Ni | |
29 | 81Cu | |
30 | 82Zn | |
31 | 83Ga | |
32 | 84Ge | |
33 | 85As | |
34 | 86Se | |
35 | 87Br | |
36 | 88Kr | 99Kr |
37 | 89Rb | 99Rb |
38 | 90Sr | 99Sr |
39 | 91Y | 99Y |
40 | 92Zr | 99Zr |
41 | 93Nb | 99Nb |
42 | 94Mo | 99Mo |
43 | 95Tc | 99Tc |
44 | 96Ru | 99Ru |
45 | 97Rh | 99Rh |
46 | 98Pd | 99Pd |
47 | 99Ag | 99Ag |
48 | 100Cd | 99Cd |
49 | 101In | 99In |
50 | 102Sn | 99Sn |
51 | 103Sb | |
Last update: 2020-10-16
Perma link: https://www.chemlin.org/isotope/silver-99m
© 1996 - 2024 ChemLin