Polonium-194
Properties and data of the isotope 194Po.
See also: List of individual Polonium isotopes (and general data sources).
General data
Name of the isotope:Polonium-194; Po-194Symbol:194Po or 19484PoMass number A:194 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3095238095238 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:193.988186(14) u (atomic weight of Polonium-194)Nuclide mass:193.9421107 u (calculated nuclear mass without electrons)Mass excess:-11.00467 MeVMass defect:1.622257448 u (per nucleus)Nuclear binding energy:1511.12307927 MeV (per nucleus)
7.78929422 MeV (average binding energy per nucleon)Separation energy:SN = 10.751(19) MeV (first neutron)
SP = 2.409(15) MeV (first proton)Half-life:0.392(4) sDecay constant λ:1.7682326034692 s-1Specific activity α:5.517381249339 × 10+21 Bq g-1
149118412144.3 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.5167(178) femtometer fmYear of discovery:1967
Radioactive Decay
Half-life T½ = 0.392(4) s respectively 3.92 × 10-1 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 190Pb | ca. 100 % | 6.987(3) MeV | |
| EC/β+ | 194Bi | ? | 5.024(14) MeV | |
Parent Nuclides
Direct parent isotope is: 198Rn.
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 |
|---|
| 194mPo | 2525.2(8) keV | 15(2) μs | (11-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 194) with Polonium-194. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 110 | Isobar A = 194 |
|---|
| 69 | 179Tm | |
| 70 | 180Yb | |
| 71 | 181Lu | |
| 72 | 182Hf | |
| 73 | 183Ta | 194Ta |
| 74 | 184W | 194W |
| 75 | 185Re | 194Re |
| 76 | 186Os | 194Os |
| 77 | 187Ir | 194Ir |
| 78 | 188Pt | 194Pt |
| 79 | 189Au | 194Au |
| 80 | 190Hg | 194Hg |
| 81 | 191Tl | 194Tl |
| 82 | 192Pb | 194Pb |
| 83 | 193Bi | 194Bi |
| 84 | 194Po | 194Po |
| 85 | 195At | 194At |
| 86 | 196Rn | 194Rn |
External data and identifiers
Last update: 2020-10-07
Perma link: https://www.chemlin.org/isotope/polonium-194
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