Strontium-105

Properties and data of the isotope ¹⁰⁵Sr.

Contents

General data

Name of the isotope:Strontium-105; Sr-105Symbol:¹⁰⁵Sr or 10538SrMass number A:105 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:67Isotopic mass:104.95855(54) u (atomic weight of Strontium-105)Nuclide mass:104.9377048 u (calculated nuclear mass without electrons)Mass excess:-38.61043 MeVMass defect:0.919350588 u (per nucleus)Nuclear binding energy:856.36955662 MeV (per nucleus)
8.15590054 MeV (average binding energy per nucleon)Separation energy:S_N = 2.58(58) MeV (first neutron)Half-life:39(5) msDecay constant λ:17.773004629742 s^-1Specific activity α:1.02914939792 × 10⁺²³ Bq g^-1
2781484859267.6 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1997

Radioactive Decay

Half-life T_½ = 39(5) ms respectively 3.9 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹⁰⁵Y		12.66 MeV
β^-, n	¹⁰⁴Y	?	7.38(64) MeV
β^-, 2n	¹⁰³Y	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 105) with Strontium-105. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 67	Isobar A = 105
38	¹⁰⁵Sr	¹⁰⁵Sr
39	¹⁰⁶Y	¹⁰⁵Y
40	¹⁰⁷Zr	¹⁰⁵Zr
41	¹⁰⁸Nb	¹⁰⁵Nb
42	¹⁰⁹Mo	¹⁰⁵Mo
43	¹¹⁰Tc	¹⁰⁵Tc
44	¹¹¹Ru	¹⁰⁵Ru
45	¹¹²Rh	¹⁰⁵Rh
46	¹¹³Pd	¹⁰⁵Pd
47	¹¹⁴Ag	¹⁰⁵Ag
48	¹¹⁵Cd	¹⁰⁵Cd
49	¹¹⁶In	¹⁰⁵In
50	¹¹⁷Sn	¹⁰⁵Sn
51	¹¹⁸Sb	¹⁰⁵Sb
52	¹¹⁹Te	¹⁰⁵Te
53	¹²⁰I
54	¹²¹Xe
55	¹²²Cs
56	¹²³Ba
57	¹²⁴La
58	¹²⁵Ce
59	¹²⁶Pr
60	¹²⁷Nd
61	¹²⁸Pm
62	¹²⁹Sm
63	¹³⁰Eu