Rhodium-91m

Properties and data of the isotope ^91mRh.

Contents

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

General data

Name of the isotope:Rhodium-91m; Rh-91mSymbol:^91mRh or 91m45RhMass number A:91 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:46Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.0222222222222 (= neutron-proton ratio)Neutron excess (N-Z):1Excitation energy:172.9(4) keVIsotopic mass:90.93712(32) u (atomic weight of Rhodium-91m)Nuclide mass:90.9124352 u (calculated nuclear mass without electrons)Mass excess:-58.57234 MeVMass defect:0.81359257600002 u (per nucleus)Nuclear binding energy:757.85660299 MeV (per nucleus)
8.32809454 MeV (average binding energy per nucleon)Half-life:1.46(11) sDecay constant λ:0.47475834284928 s^-1Specific activity α:3.176735127853 × 10⁺²¹ Bq g^-1
85857706158.214 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)

Radioactive Decay

Half-life T_½ = 1.46(11) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹¹Ru	?
Iso	⁹¹Rh	?

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
⁹¹Rh		1.47(22) s	(9/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 91) with Rhodium-91m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 91
25	⁷¹Mn
26	⁷²Fe
27	⁷³Co
28	⁷⁴Ni
29	⁷⁵Cu
30	⁷⁶Zn
31	⁷⁷Ga
32	⁷⁸Ge
33	⁷⁹As	⁹¹As
34	⁸⁰Se	⁹¹Se
35	⁸¹Br	⁹¹Br
36	⁸²Kr	⁹¹Kr
37	⁸³Rb	⁹¹Rb
38	⁸⁴Sr	⁹¹Sr
39	⁸⁵Y	⁹¹Y
40	⁸⁶Zr	⁹¹Zr
41	⁸⁷Nb	⁹¹Nb
42	⁸⁸Mo	⁹¹Mo
43	⁸⁹Tc	⁹¹Tc
44	⁹⁰Ru	⁹¹Ru
45	⁹¹Rh	⁹¹Rh
46	⁹²Pd	⁹¹Pd
47	⁹³Ag
48	⁹⁴Cd