Rhodium-120m

Properties and data of the isotope ¹²⁰Rh.

Content

General data

Name of the isotope:Rhodium-120m; Rh-120mSymbol:¹²⁰Rh or 12045RhMass number A:120 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:75Isotopic mass:119.93686(21) u (atomic weight of Rhodium-120m)
Excitation energy: 157.2(7) keVNuclide mass:119.9121752 u (calculated nuclear mass without electrons)Mass excess:-58.81453 MeVMass defect:1.06513514 u (per nucleus)Nuclear binding energy:992.1669921 MeV (per nucleus)
8.26805827 MeV (average binding energy per nucleon)Half-life:0.294 μsDecay constant λ:2357643.4712923 s^-1Specific activity α:1.193114376607 × 10⁺²⁸ Bq g^-1
3.224633450291 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 0.294 μs respectively 2.94 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹²⁰Rh	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
¹²⁰Rh		132 ms

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 120) with Rhodium-120m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 75	Isobar A = 120
42	¹¹⁷Mo
43	¹¹⁸Tc	¹²⁰Tc
44	¹¹⁹Ru	¹²⁰Ru
45	¹²⁰Rh	¹²⁰Rh
46	¹²¹Pd	¹²⁰Pd
47	¹²²Ag	¹²⁰Ag
48	¹²³Cd	¹²⁰Cd
49	¹²⁴In	¹²⁰In
50	¹²⁵Sn	¹²⁰Sn
51	¹²⁶Sb	¹²⁰Sb
52	¹²⁷Te	¹²⁰Te
53	¹²⁸I	¹²⁰I
54	¹²⁹Xe	¹²⁰Xe
55	¹³⁰Cs	¹²⁰Cs
56	¹³¹Ba	¹²⁰Ba
57	¹³²La	¹²⁰La
58	¹³³Ce	¹²⁰Ce
59	¹³⁴Pr
60	¹³⁵Nd
61	¹³⁶Pm
62	¹³⁷Sm
63	¹³⁸Eu
64	¹³⁹Gd
65	¹⁴⁰Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm