Rhodium-122m

Properties and data of the isotope ^122mRh.

Contents

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

General data

Name of the isotope:Rhodium-122m; Rh-122mSymbol:^122mRh or 122m45RhMass number A:122 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:77Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.7111111111111 (= neutron-proton ratio)Neutron excess (N-Z):32Excitation energy:271.0(7) keVIsotopic mass:121.94409(32) u (atomic weight of Rhodium-122m)Nuclide mass:121.9194052 u (calculated nuclear mass without electrons)Mass excess:-52.07983 MeVMass defect:1.075234972 u (per nucleus)Nuclear binding energy:1001.57492501 MeV (per nucleus)
8.20963053 MeV (average binding energy per nucleon)Half-life:0.82 μsDecay constant λ:845301.43970725 s^-1Specific activity α:4.207044908284 × 10⁺²⁷ Bq g^-1
1.137039164401 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 0.82 μs respectively 8.2 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹²²Rh	100 %

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
¹²²Rh		300 ns

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 122) with Rhodium-122m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 77	Isobar A = 122
43	¹²⁰Tc
44	¹²¹Ru	¹²²Ru
45	¹²²Rh	¹²²Rh
46	¹²³Pd	¹²²Pd
47	¹²⁴Ag	¹²²Ag
48	¹²⁵Cd	¹²²Cd
49	¹²⁶In	¹²²In
50	¹²⁷Sn	¹²²Sn
51	¹²⁸Sb	¹²²Sb
52	¹²⁹Te	¹²²Te
53	¹³⁰I	¹²²I
54	¹³¹Xe	¹²²Xe
55	¹³²Cs	¹²²Cs
56	¹³³Ba	¹²²Ba
57	¹³⁴La	¹²²La
58	¹³⁵Ce	¹²²Ce
59	¹³⁶Pr	¹²²Pr
60	¹³⁷Nd
61	¹³⁸Pm
62	¹³⁹Sm
63	¹⁴⁰Eu
64	¹⁴¹Gd
65	¹⁴²Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm