[en] The level structure of ²⁴Mg and decay properties of the 129 ms sup(24m)Al and 2.07 s ²⁴Al have been investigated by means of γ-ray and particle spectroscopy. The energy and intensity of the isomeric transition were measured to be 425.8+-0.1 keV and 82.5+-3.0 %, respectively. The isomer was observed to decay via a super-allowed transition with a log ft value of 3.51+-0.04 to its 1⁺, 9965.2+-1.5 keV analog state in ²⁴Mg. In addition, decay to seven particle-emitting levels and four levels depopulated by γ-ray emission were observed. In the decay of the 2.07 s ²⁴Al a new delayed α-particle group with an energy 3.04 MeV and three new γ transitions were observed. More accurate values than those reported in earlier studies are given for γ-ray energies and intensities, and also for deduced level energies in ²⁴Mg. Particle branches (per disintegration) were measured for the observed delayed-particle groups. (author)