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Tungsten-185m

Properties and data of the isotope 185W.


Content

See also: list of Tungsten isotopes.

 

General data

Name of the isotope:Tungsten-185m; W-185mSymbol:185W or 18574WMass number A:185 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:111Isotopic mass:184.9534213(8) u (atomic weight of Tungsten-185m)
Excitation energy: 197.383(23) keV
Nuclide mass:184.9128304 u (calculated nuclear mass without electrons)Mass excess:-43.38778 MeVMass defect:1.587436744 u (per nucleus)Nuclear binding energy:1478.68780242 MeV (per nucleus)
7.99290704 MeV (average binding energy per nucleon)
Half-life:1.67(3) minDecay constant λ:0.0069176365325344 s-1Specific activity α:2.264075087867 × 10+19 Bq g-1
611912185.91019 Ci g-1
Spin and parity:
(nuclear angular momentum)
11/2+

 

Radioactive Decay

Half-life T½ = 1.67(3) min (minutes) respectively 1.002 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
Iso185W100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
185W75.1(3) d3/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 185) with Tungsten-185m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 111Isobar A = 185
70181Yb185Yb
71182Lu185Lu
72183Hf185Hf
73184Ta185Ta
74185W185W
75186Re185Re
76187Os185Os
77188Ir185Ir
78189Pt185Pt
79190Au185Au
80191Hg185Hg
81192Tl185Tl
82193Pb185Pb
83194Bi185Bi
84195Po
85196At
86197Rn

 


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Last update: 2020-10-21


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