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Bismuth-195m

Properties and data of the isotope 195mBi.


Contents

See also: list of Bismuth isotopes.

 

General data

Name of the isotope:Bismuth-195m; Bi-195mSymbol:195mBi or 195m83BiMass number A:195 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:112Isotopic mass:194.980649(6) u (atomic weight of Bismuth-195m)
Excitation energy: 401(7) keV
Nuclide mass:194.9351221 u (calculated nuclear mass without electrons)Mass excess:-18.02534 MeVMass defect:1.639299248 u (per nucleus)Nuclear binding energy:1526.99741372 MeV (per nucleus)
7.83075597 MeV (average binding energy per nucleon)
Half-life:87(1) sDecay constant λ:0.0079672089719534 s-1Specific activity α:2.473178076786 × 10+19 Bq g-1
668426507.23954 Ci g-1
Spin and parity:
(nuclear angular momentum)
(1/2+)

 

Radioactive Decay

Half-life T½ = 87(1) s respectively 8.7 × 101 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
α191Tl33(17) %
EC/β+195Pb67(17) %

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
195Bi183(4) s(9/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 195) with Bismuth-195m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 112Isobar A = 195
70182Yb
71183Lu
72184Hf
73185Ta
74186W195W
75187Re195Re
76188Os195Os
77189Ir195Ir
78190Pt195Pt
79191Au195Au
80192Hg195Hg
81193Tl195Tl
82194Pb195Pb
83195Bi195Bi
84196Po195Po
85197At195At
86198Rn195Rn
87199Fr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 195Bi

 


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Last update: 2020-10-23


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