Strontium-100

Properties and data of the isotope ¹⁰⁰Sr.

Content

General data

Name of the isotope:Strontium-100; Sr-100Symbol:¹⁰⁰Sr or 10038SrMass number A:100 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:62Isotopic mass:99.935780(8) u (atomic weight of Strontium-100)Nuclide mass:99.9149348 u (calculated nuclear mass without electrons)Mass excess:-59.82054 MeVMass defect:0.89879600800001 u (per nucleus)Nuclear binding energy:837.22308868 MeV (per nucleus)
8.37223089 MeV (average binding energy per nucleon)Separation energy:S_N = 5.371(9) MeV (first neutron)
S_P = 15.989(8) MeV (first proton)Half-life:202(3) msDecay constant λ:3.4314216859403 s^-1Specific activity α:2.087323711371 × 10⁺²² Bq g^-1
564141543613.81 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.464(24) femtometer fmYear of discovery:1978

Radioactive Decay

Half-life T_½ = 202(3) ms respectively 2.02 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁰Y	99.22 %	7.506(13) MeV
β^-, n	⁹⁹Y	0.78(13) %	2.758(10) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁰Rb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 100) with Strontium-100. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 62	Isobar A = 100
35	⁹⁷Br
36	⁹⁸Kr	¹⁰⁰Kr
37	⁹⁹Rb	¹⁰⁰Rb
38	¹⁰⁰Sr	¹⁰⁰Sr
39	¹⁰¹Y	¹⁰⁰Y
40	¹⁰²Zr	¹⁰⁰Zr
41	¹⁰³Nb	¹⁰⁰Nb
42	¹⁰⁴Mo	¹⁰⁰Mo
43	¹⁰⁵Tc	¹⁰⁰Tc
44	¹⁰⁶Ru	¹⁰⁰Ru
45	¹⁰⁷Rh	¹⁰⁰Rh
46	¹⁰⁸Pd	¹⁰⁰Pd
47	¹⁰⁹Ag	¹⁰⁰Ag
48	¹¹⁰Cd	¹⁰⁰Cd
49	¹¹¹In	¹⁰⁰In
50	¹¹²Sn	¹⁰⁰Sn
51	¹¹³Sb
52	¹¹⁴Te
53	¹¹⁵I
54	¹¹⁶Xe
55	¹¹⁷Cs
56	¹¹⁸Ba
57	¹¹⁹La
58	¹²⁰Ce
59	¹²¹Pr