Strontium-82

Properties and data of the isotope ⁸²Sr.

Contents

General data

Name of the isotope:Strontium-82; Sr-82Symbol:⁸²Sr or 8238SrMass number A:82 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:44Isotopic mass:81.918400(6) u (atomic weight of Strontium-82)Nuclide mass:81.8975548 u (calculated nuclear mass without electrons)Mass excess:-76.00991 MeVMass defect:0.76020751999999 u (per nucleus)Nuclear binding energy:708.12874363 MeV (per nucleus)
8.63571639 MeV (average binding energy per nucleon)Separation energy:S_N = 12.553(7) MeV (first neutron)
S_P = 7.842(8) MeV (first proton)Half-life:25.35(3) dDecay constant λ:3.164708801592 × 10^-7 s^-1Specific activity α:2.352879281959 × 10⁺¹⁵ Bq g^-1
63591.331944846 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.2478(30) femtometer fmYear of discovery:1952

Radioactive Decay

Half-life T_½ = 25.35(3) d respectively 2.190240 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	⁸²Rb		0.178(7) MeV

Parent Nuclides

Direct parent isotope is: ⁸²Y.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 82) with Strontium-82. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 44	Isobar A = 82
23	⁶⁷V
24	⁶⁸Cr
25	⁶⁹Mn
26	⁷⁰Fe
27	⁷¹Co
28	⁷²Ni
29	⁷³Cu	⁸²Cu
30	⁷⁴Zn	⁸²Zn
31	⁷⁵Ga	⁸²Ga
32	⁷⁶Ge	⁸²Ge
33	⁷⁷As	⁸²As
34	⁷⁸Se	⁸²Se
35	⁷⁹Br	⁸²Br
36	⁸⁰Kr	⁸²Kr
37	⁸¹Rb	⁸²Rb
38	⁸²Sr	⁸²Sr
39	⁸³Y	⁸²Y
40	⁸⁴Zr	⁸²Zr
41	⁸⁵Nb	⁸²Nb
42	⁸⁶Mo	⁸²Mo
43	⁸⁷Tc
44	⁸⁸Ru
45	⁸⁹Rh
46	⁹⁰Pd