Zirconium-109

Properties and data of the isotope ¹⁰⁹Zr.

Content

General data

Name of the isotope:Zirconium-109; Zr-109Symbol:¹⁰⁹Zr or 10940ZrMass number A:109 (= number of nucleons)Atomic number Z:40 (= number of protons)Neutrons N:69Isotopic mass:108.95041(54) u (atomic weight of Zirconium-109)Nuclide mass:108.9284678 u (calculated nuclear mass without electrons)Mass excess:-46.19279 MeVMass defect:0.960470484 u (per nucleus)Nuclear binding energy:894.67249302 MeV (per nucleus)
8.20800452 MeV (average binding energy per nucleon)Separation energy:S_N = 2.91(64) MeV (first neutron)
S_P = 16.18(78) MeV (first proton)Half-life:56(3) msDecay constant λ:12.377628224285 s^-1Specific activity α:6.901835248015 × 10⁺²² Bq g^-1
1865360877842.1 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1997

Radioactive Decay

Half-life T_½ = 56(3) ms respectively 5.6 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^- ?	¹⁰⁹Nb	100 %	10.50(57) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 109) with Zirconium-109. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 69	Isobar A = 109
38	¹⁰⁷Sr
39	¹⁰⁸Y	¹⁰⁹Y
40	¹⁰⁹Zr	¹⁰⁹Zr
41	¹¹⁰Nb	¹⁰⁹Nb
42	¹¹¹Mo	¹⁰⁹Mo
43	¹¹²Tc	¹⁰⁹Tc
44	¹¹³Ru	¹⁰⁹Ru
45	¹¹⁴Rh	¹⁰⁹Rh
46	¹¹⁵Pd	¹⁰⁹Pd
47	¹¹⁶Ag	¹⁰⁹Ag
48	¹¹⁷Cd	¹⁰⁹Cd
49	¹¹⁸In	¹⁰⁹In
50	¹¹⁹Sn	¹⁰⁹Sn
51	¹²⁰Sb	¹⁰⁹Sb
52	¹²¹Te	¹⁰⁹Te
53	¹²²I	¹⁰⁹I
54	¹²³Xe	¹⁰⁹Xe
55	¹²⁴Cs
56	¹²⁵Ba
57	¹²⁶La
58	¹²⁷Ce
59	¹²⁸Pr
60	¹²⁹Nd
61	¹³⁰Pm
62	¹³¹Sm
63	¹³²Eu