Gallium-74m

Properties and data of the isotope ⁷⁴Ga.

Content

General data

Name of the isotope:Gallium-74m; Ga-74mSymbol:⁷⁴Ga or 7431GaMass number A:74 (= number of nucleons)Atomic number Z:31 (= number of protons)Neutrons N:43Isotopic mass:73.926946(3) u (atomic weight of Gallium-74m)
Excitation energy: 59.571(14) keVNuclide mass:73.9099406 u (calculated nuclear mass without electrons)Mass excess:-68.04936 MeVMass defect:0.68822138 u (per nucleus)Nuclear binding energy:641.07408614 MeV (per nucleus)
8.66316333 MeV (average binding energy per nucleon)Half-life:9.5(10) sDecay constant λ:0.072962861111573 s^-1Specific activity α:6.019077084354 × 10⁺²⁰ Bq g^-1
16267775903.661 Ci g^-1Spin and parity:
(nuclear angular momentum)(0+)

Radioactive Decay

Half-life T_½ = 9.5(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷⁴Ga	75(25) %
β^-	⁷⁴Ge	25(25) %

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
⁷⁴Ga		8.12(12) min	(3-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 74) with Gallium-74m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 43	Isobar A = 74
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn
26	⁶⁹Fe	⁷⁴Fe
27	⁷⁰Co	⁷⁴Co
28	⁷¹Ni	⁷⁴Ni
29	⁷²Cu	⁷⁴Cu
30	⁷³Zn	⁷⁴Zn
31	⁷⁴Ga	⁷⁴Ga
32	⁷⁵Ge	⁷⁴Ge
33	⁷⁶As	⁷⁴As
34	⁷⁷Se	⁷⁴Se
35	⁷⁸Br	⁷⁴Br
36	⁷⁹Kr	⁷⁴Kr
37	⁸⁰Rb	⁷⁴Rb
38	⁸¹Sr	⁷⁴Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru