Trace Sciences International

Strontium Isotopes

Nominal Mass
Accurate Mass
% Natural Abundance
Chemical Form
Enrichment Available %

84 Sr

83.913430 (4)

0.56 (13)

carbonate

75 – 79+

86 Sr

85.9092672 (28)

9.86(13)

carbonate

95 – 96+

87 Sr

86.9088841 (28)

7 (13)

carbonate

38 – 92+

88 Sr

87.9056188 (28)

82.58 (13)

carbonate

99+

There are four stable Strontium Isotopes and two of them have medical applications. Sr-86 is used for the production of the PET isotope Y-86 which is used in dosimetry prior to Y-90 based radioimmunotherapy. Sr-88 is used for the production of Sr-89 which is the active agent in Metastron™.