Rhodium-109m

Properties and data of the isotope ^109mRh.

Contents

See also: List of individual Rhodium isotopes (and general data sources).

General data

Name of the isotope:Rhodium-109m; Rh-109mSymbol:^109mRh or 109m45RhMass number A:109 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:64Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4222222222222 (= neutron-proton ratio)Neutron excess (N-Z):19Excitation energy:225.873(19) keVIsotopic mass:108.908749(4) u (atomic weight of Rhodium-109m)Nuclide mass:108.8840642 u (calculated nuclear mass without electrons)Mass excess:-84.99976 MeVMass defect:0.997932064 u (per nucleus)Nuclear binding energy:929.56773002 MeV (per nucleus)
8.52814431 MeV (average binding energy per nucleon)Half-life:1.66(4) μsDecay constant λ:417558.54250599 s^-1Specific activity α:2.328329963186 × 10⁺²⁷ Bq g^-1
6.292783684286 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁰⁹Rh		80.8(7) s	7/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 109) with Rhodium-109m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 64	Isobar A = 109
36	¹⁰⁰Kr
37	¹⁰¹Rb
38	¹⁰²Sr
39	¹⁰³Y	¹⁰⁹Y
40	¹⁰⁴Zr	¹⁰⁹Zr
41	¹⁰⁵Nb	¹⁰⁹Nb
42	¹⁰⁶Mo	¹⁰⁹Mo
43	¹⁰⁷Tc	¹⁰⁹Tc
44	¹⁰⁸Ru	¹⁰⁹Ru
45	¹⁰⁹Rh	¹⁰⁹Rh
46	¹¹⁰Pd	¹⁰⁹Pd
47	¹¹¹Ag	¹⁰⁹Ag
48	¹¹²Cd	¹⁰⁹Cd
49	¹¹³In	¹⁰⁹In
50	¹¹⁴Sn	¹⁰⁹Sn
51	¹¹⁵Sb	¹⁰⁹Sb
52	¹¹⁶Te	¹⁰⁹Te
53	¹¹⁷I	¹⁰⁹I
54	¹¹⁸Xe	¹⁰⁹Xe
55	¹¹⁹Cs
56	¹²⁰Ba
57	¹²¹La
58	¹²²Ce
59	¹²³Pr
60	¹²⁴Nd