Strontium-103

Properties and data of the isotope ¹⁰³Sr.

Contents

General data

Name of the isotope:Strontium-103; Sr-103Symbol:¹⁰³Sr or 10338SrMass number A:103 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:65Isotopic mass:102.94909(21) u (atomic weight of Strontium-103)Nuclide mass:102.9282448 u (calculated nuclear mass without electrons)Mass excess:-47.42236 MeVMass defect:0.911480756 u (per nucleus)Nuclear binding energy:849.03885533 MeV (per nucleus)
8.24309568 MeV (average binding energy per nucleon)Separation energy:S_N = 3.33(21) MeV (first neutron)
S_P = 17.00(36) MeV (first proton)Half-life:53(10) msDecay constant λ:13.07824868981 s^-1Specific activity α:7.721476059933 × 10⁺²² Bq g^-1
2086885421603.6 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1997

Radioactive Decay

Half-life T_½ = 53(10) ms respectively 5.3 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹⁰³Y		11.03(20) MeV
β^-, n	¹⁰²Y	?	5.68(20) MeV
β^-, 2n	¹⁰¹Y	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 103) with Strontium-103. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 65	Isobar A = 103
36	¹⁰¹Kr
37	¹⁰²Rb	¹⁰³Rb
38	¹⁰³Sr	¹⁰³Sr
39	¹⁰⁴Y	¹⁰³Y
40	¹⁰⁵Zr	¹⁰³Zr
41	¹⁰⁶Nb	¹⁰³Nb
42	¹⁰⁷Mo	¹⁰³Mo
43	¹⁰⁸Tc	¹⁰³Tc
44	¹⁰⁹Ru	¹⁰³Ru
45	¹¹⁰Rh	¹⁰³Rh
46	¹¹¹Pd	¹⁰³Pd
47	¹¹²Ag	¹⁰³Ag
48	¹¹³Cd	¹⁰³Cd
49	¹¹⁴In	¹⁰³In
50	¹¹⁵Sn	¹⁰³Sn
51	¹¹⁶Sb	¹⁰³Sb
52	¹¹⁷Te
53	¹¹⁸I
54	¹¹⁹Xe
55	¹²⁰Cs
56	¹²¹Ba
57	¹²²La
58	¹²³Ce
59	¹²⁴Pr
60	¹²⁵Nd
61	¹²⁶Pm