Strontium-94

Properties and data of the isotope ⁹⁴Sr.

Contents

General data

Name of the isotope:Strontium-94; Sr-94Symbol:⁹⁴Sr or 9438SrMass number A:94 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:56Isotopic mass:93.9153556(18) u (atomic weight of Strontium-94)Nuclide mass:93.8945104 u (calculated nuclear mass without electrons)Mass excess:-78.84575 MeVMass defect:0.867230912 u (per nucleus)Nuclear binding energy:807.82039114 MeV (per nucleus)
8.59383395 MeV (average binding energy per nucleon)Separation energy:S_N = 6.831(8) MeV (first neutron)
S_P = 13.515(8) MeV (first proton)Half-life:75.3(2) sDecay constant λ:0.0092051418401055 s^-1Specific activity α:5.96071621471 × 10⁺¹⁹ Bq g^-1
1611004382.3543 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.3191(91) femtometer fmYear of discovery:1959

Radioactive Decay

Half-life T_½ = 75.3(2) s respectively 7.53 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹⁴Y	100%	3.506(6) MeV

Parent Nuclides

Direct parent isotope is: ⁹⁴Rb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 56) and isobaric (same nucleon number A = 94) with Strontium-94. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 56	Isobar A = 94
31	⁸⁷Ga
32	⁸⁸Ge
33	⁸⁹As
34	⁹⁰Se	⁹⁴Se
35	⁹¹Br	⁹⁴Br
36	⁹²Kr	⁹⁴Kr
37	⁹³Rb	⁹⁴Rb
38	⁹⁴Sr	⁹⁴Sr
39	⁹⁵Y	⁹⁴Y
40	⁹⁶Zr	⁹⁴Zr
41	⁹⁷Nb	⁹⁴Nb
42	⁹⁸Mo	⁹⁴Mo
43	⁹⁹Tc	⁹⁴Tc
44	¹⁰⁰Ru	⁹⁴Ru
45	¹⁰¹Rh	⁹⁴Rh
46	¹⁰²Pd	⁹⁴Pd
47	¹⁰³Ag	⁹⁴Ag
48	¹⁰⁴Cd	⁹⁴Cd
49	¹⁰⁵In
50	¹⁰⁶Sn
51	¹⁰⁷Sb
52	¹⁰⁸Te
53	¹⁰⁹I
54	¹¹⁰Xe