Polonium-190
Properties and data of the isotope 190Po.
See also: list of Polonium isotopes.
General data
Name of the isotope:Polonium-190; Po-190Symbol:190Po or 19084PoMass number A:190 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:106Isotopic mass:189.995101(14) u (atomic weight of Polonium-190)Nuclide mass:189.9490257 u (calculated nuclear mass without electrons)Mass excess:-4.56339 MeVMass defect:1.580682784 u (per nucleus)Nuclear binding energy:1472.3965292 MeV (per nucleus)
7.74945542 MeV (average binding energy per nucleon)Separation energy:SN = 11.213(26) MeV (first neutron)
SP = 1.788(25) MeV (first proton)Half-life:2.46(5) msDecay constant λ:281.76714656908 s-1Specific activity α:8.977997070589 × 10+23 Bq g-1
24264856947540 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1996
Radioactive Decay
Half-life T½ = 2.46(5) ms respectively 2.46 × 10-3 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 186Pb | 100 % | 7.693(7) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 190) with Polonium-190. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 106 | Isobar A = 190 |
64 | 170Gd | |
65 | 171Tb | |
66 | 172Dy | |
67 | 173Ho | |
68 | 174Er | |
69 | 175Tm | |
70 | 176Yb | |
71 | 177Lu | |
72 | 178Hf | 190Hf |
73 | 179Ta | 190Ta |
74 | 180W | 190W |
75 | 181Re | 190Re |
76 | 182Os | 190Os |
77 | 183Ir | 190Ir |
78 | 184Pt | 190Pt |
79 | 185Au | 190Au |
80 | 186Hg | 190Hg |
81 | 187Tl | 190Tl |
82 | 188Pb | 190Pb |
83 | 189Bi | 190Bi |
84 | 190Po | 190Po |
85 | 191At | 190At |
External data and identifiers
Last update: 2020-10-07
Perma link: https://www.chemlin.org/isotope/polonium-190
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