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Isotopes of Strontium

List, data and properties of all known isotopes of Strontium.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Strontium isotopes

All atomic nuclei of the chemical element strontium are summarized under strontium isotopes; these all consist of an atomic nucleus with 38 protons and, in the uncharged state, 38 electrons. The difference between each strontium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Strontium Isotopes

Of the four stable strontium isotopes found in nature, the isotope 88Sr is the most common nuclide with a proportion of over 82%. Sr-87 enters nature as a stable decay product of the radioactive rubidium isotope Rb-87.

Atomic Mass maQuantityHalf-lifeSpin
Strontium
Isotopic mixture		87,62 u100 %
Isotope 84Sr83,913419(8) u0,57 %stable0+
Isotope 86Sr85,909261(8) u9,87 %stable0+
Isotope 88Sr87,905613(8) u82,52 %stable0+
Isotope 87Sr86,908878(8) u7,00(20) %stable9/2+

 

The other known isotopes and nuclear isomers are unstable radioisotopes, of which in particular the anthropogenically produced Sr-90 occasionally escapes into the environment and causes radiation damage.

 

Isotope Table: Strontium

The two following tables list the most important data and properties of the Strontium isotopes. Further information on the individual Strontium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Strontium-737338Sr3572.96570(43) u
[72.9448548 u]
{-31.95024 MeV}		5/2-
Strontium-747438Sr3673.95617(11) u
[73.9353248 u]
{-40.82738 MeV}		0+
Strontium-757538Sr3774.94995(24) u
[74.9291048 u]
{-46.62127 MeV}		(3/2-)76Y
Strontium-767638Sr3875.94176(4) u
[75.9209148 u]
{-54.25021 MeV}		0+
Strontium-777738Sr3976.937945(8) u
[76.9170998 u]
{-57.80386 MeV}		5/2(+)77Y
Strontium-787838Sr4077.932180(8) u
[77.9113348 u]
{-63.17392 MeV}		0+78Y
Strontium-797938Sr4178.929708(9) u
[78.9088628 u]
{-65.47658 MeV}		3/2(-)79Y
Strontium-808038Sr4279.924518(4) u
[79.9036728 u]
{-70.31103 MeV}		0+80Y
Strontium-818138Sr4380.923211(3) u
[80.9023658 u]
{-71.52849 MeV}		1/2-81Y
Strontium-828238Sr4481.918400(6) u
[81.8975548 u]
{-76.00991 MeV}		0+82Y
Strontium-838338Sr4582.917554(7) u
[82.8967088 u]
{-76.79795 MeV}		7/2+83Y
Strontium-83m83m38Sr4582.917554(7) u
[82.8967088 u]
{-76.79795 MeV}		1/2-
Strontium-848438Sr4683.913419(8) u
[83.8925738 u]
{-80.64968 MeV}		0+84Y
84Rb
Strontium-858538Sr4784.912932(3) u
[84.8920868 u]
{-81.10332 MeV}		9/2+85Y
Strontium-85m85m38Sr4784.912932(3) u
[84.8920868 u]
{-81.10332 MeV}		1/2-
Strontium-868638Sr4885.909261(8) u
[85.8884158 u]
{-84.52283 MeV}		0+86Y
86Rb
Strontium-86m86m38Sr4885.909261(8) u
[85.8884158 u]
{-84.52283 MeV}		8+
Strontium-878738Sr4986.908878(8) u
[86.8880328 u]
{-84.8796 MeV}		9/2+87Y
87Rb
Strontium-87m87m38Sr4986.908878(8) u
[86.8880328 u]
{-84.8796 MeV}		1/2-
Strontium-888838Sr5087.905613(8) u
[87.8847678 u]
{-87.92092 MeV}		0+88Y
88Rb
Strontium-898938Sr5188.90745081(10) u
[88.8866056 u]
{-86.20902 MeV}		5/2+89Rb
Strontium-909038Sr5289.9077279(16) u
[89.8868827 u]
{-85.95091 MeV}		0+90Rb
Strontium-919138Sr5390.910196(6) u
[90.8893508 u]
{-83.65189 MeV}		5/2+91Rb
Strontium-929238Sr5491.911038(4) u
[91.8901928 u]
{-82.86757 MeV}		0+92Rb
Strontium-939338Sr5592.914024(8) u
[92.8931788 u]
{-80.08613 MeV}		5/2+93Rb
Strontium-949438Sr5693.9153556(18) u
[93.8945104 u]
{-78.84575 MeV}		0+94Rb
Strontium-959538Sr5794.919356(6) u
[94.8985108 u]
{-75.1194 MeV}		1/2+95Rb
Strontium-969638Sr5895.921713(9) u
[95.9008678 u]
{-72.92387 MeV}		0+96Rb
Strontium-979738Sr5996.926375(4) u
[96.9055298 u]
{-68.58125 MeV}		1/2+97Rb
Strontium-97m197m138Sr5996.926375(4) u
[96.9055298 u]
{-68.58125 MeV}		7/2+
Strontium-97m297m238Sr5996.926375(4) u
[96.9055298 u]
{-68.58125 MeV}		(9/2+)
Strontium-989838Sr6097.928692(3) u
[97.9078468 u]
{-66.42297 MeV}		0+98Rb
Strontium-999938Sr6198.932881(5) u
[98.9120358 u]
{-62.52095 MeV}		3/2+99Rb
Strontium-10010038Sr6299.935780(8) u
[99.9149348 u]
{-59.82054 MeV}		0+100Rb
Strontium-10110138Sr63100.940606(9) u
[100.9197608 u]
{-55.32515 MeV}		(5/2-)101Rb
Strontium-10210238Sr64101.94400(7) u
[101.9231548 u]
{-52.16366 MeV}		0+102Rb
Strontium-10310338Sr65102.94909(21) u
[102.9282448 u]
{-47.42236 MeV}
Strontium-10410438Sr66103.95265(32) u
[103.9318048 u]
{-44.10624 MeV}		0+
Strontium-10510538Sr67104.95855(54) u
[104.9377048 u]
{-38.61043 MeV}
Strontium-10610638Sr68105.96265(64) u
[105.9418048 u]
{-34.7913 MeV}		0+
Strontium-10710738Sr69106.96897(75) u
[106.9481248 u]
{-28.90426 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Sr-7328 msβ+ → 73Rb
EC, p → 72Kr		< 100 %
?		14.062(403) MeV
AL
Sr-7427(8) msEC/β+ → 74Rb
EC, p → 73Kr
?		11.09(10) MeV
AL
Sr-7588(3) msEC/β+ → 75Rb
EC, p → 74Kr		94.8 %
5.2(9) %		10.60(22) MeV
AL
Sr-767.89(7) sEC/β+ → 76Rb
EC, p → 75Kr		< 100 %
> 0 %		6.23(30) MeV
AL
Sr-779.0(2) sEC/β+ → 77Rb
EC, p → 76Kr		99.92 %
0.08(3) %		7.027(8)
AL
Sr-78160(8) sEC/β+ → 78Rb100 %3.761(8) MeVAL
Sr-792.25(10) minEC/β+ → 79Rb100 %5.326(9) MeVAL
Sr-80106.3(15) minEC/β+ → 80Rb100 %1.864(4) MeVAL
Sr-8122.3(4) minEC/β+ → 81Rb100 %3.929(6) MeVAL
Sr-8225.35(3) dEC → 82Rb0.178(7) MeVAL
Sr-8332.41(3) hEC/β+ → 83Rb100 %2.273(7) MeVAL
Sr-83m4.95(12) sIso → 83Sr100%AL
Sr-84stableAL
Sr-8564.849(7) dEC → 85Rb100%1.0640(28) MeVAL
Sr-85m67.63(4) minIso → 85Sr
EC → 85Rb		86.6(4) %
13.4(4) %
AL
Sr-86stableAL
Sr-86m455(7) nsIso → 86Sr100 %AL
Sr-87stableAL
Sr-87m2.815(12) hIso → 87Sr
EC → 87Rb		99.70(8) %
0.30(8) %
AL
Sr-88stableAL
Sr-8950.563(25) dβ- → 89Y100%1.5022(4) MeVAL
Sr-9028.91(3) aβ- → 90Y100%0.5460(14) MeVAL
Sr-919.65(6) hβ- → 91Y100%2.699(5) MeVAL
Sr-922.611(17) hβ- → 92Y100%1.949(9) MeVAL
Sr-937.43(3) minβ- → 93Y100%4.141(12) MeVAL
Sr-9475.3(2) sβ- → 94Y100%3.506(6) MeVAL
Sr-9523.90(14) sβ- → 95Y100%6.089(7) MeVAL
Sr-961.07(1) sβ- → 96Y100%5.412(10) MeVAL
Sr-97429(5) msβ- → 97Y
β-, n → 96Y		99.95 %
0.05 %		7.540(8) MeV
1.683(7)		AL
Sr-97m1169(9) nsAL
Sr-97m2395 nsAL
Sr-98653(2) msβ- → 98Y
β-, n → 97Y		99.75 %
0.25(5) %		5.872(9) MeV
1.627(7) MeV		AL
Sr-99269(1) msβ- → 99Y
β-, n → 98Y		99.9 %
0.1 %		8.128(8) MeV
1.702(9) MeV		AL
Sr-100202(3) msβ- → 100Y
β-, n → 99Y		99.22 %
0.78(13) %		7.506(13) MeV
2.758(10) MeV		AL
Sr-101118(3) msβ- → 101Y
β-, n → 100Y		97.63 %
2.37(14) %		9.736(11) MeV
3.931(14) MeV		AL
Sr-10269(6) msβ- → 102Y
β-, n → 101Y		94.5 %
5.5(15) %		9.01(7) MeV
4.83(7) MeV		AL
Sr-10353(10) msβ- → 103Y
β-, n → 102Y
β-, 2n → 101Y
?
?		11.03(20) MeV
5.68(20) MeV
AL
Sr-10453(5) msβ- → 104Y
β-, n → 103Y
β-, 2n → 102Y

9.96(50) MeV
6.28(30) MeV
AL
Sr-10539(5) msβ- → 105Y
β-, n → 104Y
β-, 2n → 103Y
?
?		12.66 MeV
7.38(64) MeV
AL
Sr-10620 msβ- → 106Y
β-, n → 105Y
β-, 2n → 104Y

11.26(78) MeV
8.41(146) MeV
AL
Sr-107395 nsβ- → 107Y
β-, n → 106Y
β-, 2n → 105Y		?
?
?		13.46(86) MeV
9.08(86) MeV
AL

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Strontium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Strontium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Strontium nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
87Sr
7,00(20) %
9/2+		-1,09316(11)- 1,1639376
{+ 0,305(2)}		1,85250,00272
1,4358

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Strontium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Sr-80+107 Bq1000 Bq/g1.8 h
Sr-81105 Bq10 Bq/g22.3 min
Sr-82+105 Bq1 Bq/g0,06 TBqRb-8225.4 d
Sr-83106 Bq10 Bq/g32.4 h
Sr-85106 Bq1 Bq/g0,1 TBq1 Bq cm-264.8 d
Sr-85m107 Bq100 Bq/g0,1 T Bq10 Bq cm-267.6 min
Sr-87m106 Bq100 Bq/g0,2 TBq10 Bq cm-22.8 h
Sr-89+106 Bq1000 Bq/g20 TBq100 Bq cm-250.6 d
Sr-90+104 Bq1 Bq/g1 TBq1 Bq cm-2Y-9028.8 a
Sr-91+105 Bq10 Bq/g0,06 TBq1 Bq cm-29.6 h
Sr-92106 Bq10 Bq/g0,04 TBq1 Bq cm-22.7 h

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Strontium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Strontium: NMR properties - 87Sr-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - NN:
Bestimmung von radioaktivem Strontium in der Umwelt.
In: Internetchemie News, (2008).

 

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