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Strontium-84

Properties and data of the isotope 84Sr.


Content

Strontium-84 is a naturally occurring, stable and therefore non-radioactive isotope of the chemical element strontium with atomic number 38 and mass number 84. It consists of a nucleus of 38 protons and 46 neutrons.

84 Sr is one of the most common Sr isotopes and is found in small amounts in minerals and soil. It is used in industry to produce strontium salts used in pyrotechnics, glass making and chemical analysis. Strontium-84 can also be used as a standard in mass spectrometry and serves as a reference for the determination of other isotopes.

Sr-84 is used in medical diagnostics as a marker for bone and tooth mineralization.

See also: list of Strontium isotopes.

 

General data

Name of the isotope:Strontium-84; Sr-84Symbol:84Sr or 8438SrMass number A:84 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:46Isotopic mass:83.913419(8) u (atomic weight of Strontium-84)Nuclide mass:83.8925738 u (calculated nuclear mass without electrons)Mass excess:-80.64968 MeVMass defect:0.782518352 u (per nucleus)Nuclear binding energy:728.91114978 MeV (per nucleus)
8.67751369 MeV (average binding energy per nucleon)
Separation energy:SN = 11.923(7) MeV (first neutron)
SP = 8.8679(26) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
0+Charge radius:4.2394(23) femtometer fmYear of discovery:1936

 

Parent Nuclides

Direct parent isotopes are: 84Y, 84Rb.

 

Occurrence

Comparison of the natural Strontium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Strontium
Isotopic mixture
87.62 u100 %
Isotope 84Sr83.913419(8) u0.57 %
[0.55 - 0.58 %]
stable0+
Isotope 86Sr85.909261(8) u9.87 %
[9.75 - 9.99 %]
stable0+
Isotope 88Sr87.905613(8) u82.52 %
[82.29 - 82.75 %]
stable0+
Isotope 87Sr86.908878(8) u7.00(20) %
[6.94 - 7.14 %]
stable9/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 84) with Strontium-84. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 46Isobar A = 84
2571Mn
2672Fe
2773Co
2874Ni
2975Cu
3076Zn84Zn
3177Ga84Ga
3278Ge84Ge
3379As84As
3480Se84Se
3581Br84Br
3682Kr84Kr
3783Rb84Rb
3884Sr84Sr
3985Y84Y
4086Zr84Zr
4187Nb84Nb
4288Mo84Mo
4389Tc
4490Ru
4591Rh
4692Pd
4793Ag
4894Cd

 

External data and identifiers

Adopted Levels, Gammas:NuDat 84Sr

 


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Last update: 2022-12-13


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