Strontium-92

Properties and data of the isotope ⁹²Sr.

Contents

General data

Name of the isotope:Strontium-92; Sr-92Symbol:⁹²Sr or 9238SrMass number A:92 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:54Isotopic mass:91.911038(4) u (atomic weight of Strontium-92)Nuclide mass:91.8901928 u (calculated nuclear mass without electrons)Mass excess:-82.86757 MeVMass defect:0.85421867999999 u (per nucleus)Nuclear binding energy:795.69957511 MeV (per nucleus)
8.64890843 MeV (average binding energy per nucleon)Separation energy:S_N = 7.287(6) MeV (first neutron)
S_P = 12.411(9) MeV (first proton)Half-life:2.611(17) hDecay constant λ:7.374219972764 × 10^-5 s^-1Specific activity α:4.88006498990 × 10⁺¹⁷ Bq g^-1
13189364.837584 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.2924(64) femtometer fmYear of discovery:1956

Radioactive Decay

Half-life T_½ = 2.611(17) h (hours) respectively 9.3996 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹²Y	100%	1.949(9) MeV

Parent Nuclides

Direct parent isotope is: ⁹²Rb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 54) and isobaric (same nucleon number A = 92) with Strontium-92. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 54	Isobar A = 92
30	⁸⁴Zn
31	⁸⁵Ga
32	⁸⁶Ge
33	⁸⁷As	⁹²As
34	⁸⁸Se	⁹²Se
35	⁸⁹Br	⁹²Br
36	⁹⁰Kr	⁹²Kr
37	⁹¹Rb	⁹²Rb
38	⁹²Sr	⁹²Sr
39	⁹³Y	⁹²Y
40	⁹⁴Zr	⁹²Zr
41	⁹⁵Nb	⁹²Nb
42	⁹⁶Mo	⁹²Mo
43	⁹⁷Tc	⁹²Tc
44	⁹⁸Ru	⁹²Ru
45	⁹⁹Rh	⁹²Rh
46	¹⁰⁰Pd	⁹²Pd
47	¹⁰¹Ag	⁹²Ag
48	¹⁰²Cd
49	¹⁰³In
50	¹⁰⁴Sn
51	¹⁰⁵Sb
52	¹⁰⁶Te