The results ofHe gas pulsed NMR spin-lattice relaxation study in high-porosity (84.9%-97.9%) nematically ordered AlOaerogels at 1.5 and 4.2 K are presented. The linear dependence ofon gas pressure is observed in aerogels that are pre-plated by helium-4. Nitrogen pre-plating prior to helium-4 pre-plating weakly decreases theHe gas spin-lattice relaxation rate. A few possible mechanisms plausibly involved inHe nuclear magnetic relaxation in aerogels are considered. The suggested nuclear spin-lattice relaxation model due to some magnetically 'dirty' aerogel fibers allows to estimate the effective mean free path ofHe atoms in aerogel.
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