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Isotopes of Strontium

List, data and properties of all known isotopes of Strontium as well as radioactive decay products and intermediate products.

 

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 87Sr86,908878(8) u7,04 %stable9/2+
Isotope 88Sr87,905613(8) u82,52 %stable0+

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
73Sr387335Strontium-7372.9657(43) u
[72.9448548 u]
{-31.95024 MeV}
1/2-~
74Sr387436Strontium-7473.95617(11) u
[73.9353248 u]
{-40.82738 MeV}
0+
75Sr387537Strontium-7574.94995(24) u
[74.9291048 u]
{-46.62127 MeV}
(3/2-)76Y
76Sr387638Strontium-7675.94176(4) u
[75.9209148 u]
{-54.25021 MeV}
0+
77Sr387739Strontium-7776.937945(8) u
[76.9170998 u]
{-57.80386 MeV}
5/2(+)-0.348(4)77Y
78Sr387840Strontium-7877.932180(8) u
[77.9113348 u]
{-63.17392 MeV}
0+78Y
79Sr387941Strontium-7978.929708(9) u
[78.9088628 u]
{-65.47658 MeV}
3/2(-)-0.474(4)79Y
80Sr388042Strontium-8079.924518(4) u
[79.9036728 u]
{-70.31103 MeV}
0+80Y
81Sr388143Strontium-8180.923211(3) u
[80.9023658 u]
{-71.52849 MeV}
1/2-+0.543(4)81Y
82Sr388244Strontium-8281.918400(6) u
[81.8975548 u]
{-76.00991 MeV}
0+82Y
83Sr388345Strontium-8382.917554(7) u
[82.8967088 u]
{-76.79795 MeV}
7/2+-0.8295(7)83Y
83mSr388345Strontium-83m82.917554(7) u
[82.8967088 u]
{-76.79795 MeV}
1/2-+0.581(4)
84Sr388446Strontium-8483.913419(8) u
[83.8925738 u]
{-80.64968 MeV}
0+84Y
84Rb
85Sr388547Strontium-8584.912932(3) u
[84.8920868 u]
{-81.10332 MeV}
9/2+-1.0001(7)85Y
85mSr388547Strontium-85m84.912932(3) u
[84.8920868 u]
{-81.10332 MeV}
1/2-+0.599(2)
86Sr388648Strontium-8685.909261(8) u
[85.8884158 u]
{-84.52283 MeV}
0+86Y
86Rb
86mSr388648Strontium-86m85.909261(8) u
[85.8884158 u]
{-84.52283 MeV}
8+-1.93(2)
87Sr388749Strontium-8786.908878(8) u
[86.8880328 u]
{-84.8796 MeV}
9/2+-1.09316(11)87Y
87Rb
87mSr388749Strontium-87m86.908878(8) u
[86.8880328 u]
{-84.8796 MeV}
1/2-+0.624(4)
88Sr388850Strontium-8887.905613(8) u
[87.8847678 u]
{-87.92092 MeV}
0+88Y
88Rb
89Sr388951Strontium-8988.90745081(10) u
[88.8866056 u]
{-86.20902 MeV}
5/2+-1.148(2)89Rb
90Sr389052Strontium-9089.9077309(23) u
[89.8868857 u]
{-85.94811 MeV}
0+90Rb
91Sr389153Strontium-9190.910196(6) u
[90.8893508 u]
{-83.65189 MeV}
5/2+-0.885(2)91Rb
92Sr389254Strontium-9291.911038(4) u
[91.8901928 u]
{-82.86757 MeV}
0+92Rb
93Sr389355Strontium-9392.914024(8) u
[92.8931788 u]
{-80.08613 MeV}
5/2+-0.793(2)93Rb
94Sr389456Strontium-9493.9153556(18) u
[93.8945104 u]
{-78.84575 MeV}
0+94Rb
95Sr389557Strontium-9594.919356(6) u
[94.8985108 u]
{-75.1194 MeV}
1/2+-0.537(2)95Rb
96Sr389658Strontium-9695.921713(9) u
[95.9008678 u]
{-72.92387 MeV}
0+96Rb
97Sr389759Strontium-9796.926375(4) u
[96.9055298 u]
{-68.58125 MeV}
1/2+-0.498(2)97Rb
97m1Sr389759Strontium-97m196.926375(4) u
[96.9055298 u]
{-68.58125 MeV}
7/2+
97m2Sr389759Strontium-97m296.926375(4) u
[96.9055298 u]
{-68.58125 MeV}
(9/2+)
98Sr389860Strontium-9897.928692(3) u
[97.9078468 u]
{-66.42297 MeV}
0+98Rb
99Sr389961Strontium-9998.932881(5) u
[98.9120358 u]
{-62.52095 MeV}
3/2+-0.261(5)99Rb
100Sr3810062Strontium-10099.935780(8) u
[99.9149348 u]
{-59.82054 MeV}
0+100Rb
101Sr3810163Strontium-101100.940606(9) u
[100.9197608 u]
{-55.32515 MeV}
(5/2-)101Rb
102Sr3810264Strontium-102101.94400(7) u
[101.9231548 u]
{-52.16366 MeV}
0+102Rb
103Sr3810365Strontium-103102.94909(21) u
[102.9282448 u]
{-47.42236 MeV}
104Sr3810466Strontium-104103.95265(32) u
[103.9318048 u]
{-44.10624 MeV}
0+
105Sr3810567Strontium-105104.95855(54) u
[104.9377048 u]
{-38.61043 MeV}
106Sr3810668Strontium-106105.96265(64) u
[105.9418048 u]
{-34.7913 MeV}
0+
107Sr3810769Strontium-107106.96897(75) u
[106.9481248 u]
{-28.90426 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Sr-7325 msβ+73Rb
EC, p → 72Kr
< 100 %
?
14.13(45) 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%259.15(9) keVAL
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) %

238.79(5) keVAL
Sr-86stableAL
Sr-86m455(7) nsIso → 86Sr100 %2955.68(21) keVAL
Sr-87stableAL
Sr-87m2.815(12) hIso → 87Sr
EC → 87Rb
99.70(8) %
0.30(8) %

388.5287(23) keVAL
Sr-88stableAL
Sr-8950.563(25) dβ-89Y100%1.4993(16) MeVAL
Sr-9028.79(6) aβ-90Y100%0.5459(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) ns308.13(11) keVAL
Sr-97m2395 ns830.83(23) keVAL
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Strontium isotope.
6 - 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Strontium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
87Sr
7,04 %
9/2+
-1,09316(11)- 1,1639376+ 30,5(2)1,85250,00272
1,4358

1) Quantity Percentage of natural occurrence.

2) 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), DOI https://www.internetchemie.info/news/2008/may08/bestimmung-radioaktives-strontium-umwelt.php.

 


Category: Isotopes

Last update: 05.07.2020



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