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Rubidium-85m

Properties and data of the isotope 85mRb.


Contents

See also: list of Rubidium isotopes.

 

General data

Name of the isotope:Rubidium-85m; Rb-85mSymbol:85mRb or 85m37RbMass number A:85 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:48Isotopic mass:84.91178974(3) u (atomic weight of Rubidium-85m)
Excitation energy: 514.0065(22) keV
Nuclide mass:84.8914931 u (calculated nuclear mass without electrons)Mass excess:-82.16733 MeVMass defect:0.793652412 u (per nucleus)Nuclear binding energy:739.28245986 MeV (per nucleus)
8.6974407 MeV (average binding energy per nucleon)
Half-life:1.015 μsDecay constant λ:682903.62616743 s-1Specific activity α:4.895883131597 × 10+27 Bq g-1
1.323211657188 × 10+17 Ci g-1
Spin and parity:
(nuclear angular momentum)
9/2+Magnetic dipole moment:μ(μN) = +6.043(5)Quadrupole moment Q:-0.70(2) barn (100 fm2)Nuclear g-factor:gl = 1.3428888888889

 

Radioactive Decay

Half-life T½ = 1.015 μs respectively 1.015 × 10-6 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
Iso85Rb100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
85Rbstable5/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 85) with Rubidium-85m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 48Isobar A = 85
2674Fe
2775Co
2876Ni
2977Cu
3078Zn85Zn
3179Ga85Ga
3280Ge85Ge
3381As85As
3482Se85Se
3583Br85Br
3684Kr85Kr
3785Rb85Rb
3886Sr85Sr
3987Y85Y
4088Zr85Zr
4189Nb85Nb
4290Mo85Mo
4391Tc85Tc
4492Ru85Ru
4593Rh
4694Pd
4795Ag
4896Cd
4997In

 


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Last update: 2020-10-14


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