recoil atom

re·coil at·om

the remainder of an atom from which a nuclear particle has been emitted or ejected at high velocity; the remainder recoils with a velocity inversely proportional to its mass.
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The presence of radiogenic uranium in humic acids proves that, despite of significant destruction of organic matter in the track of the recoil atom, not only the molecule of humic acid is recreated from fragments and radicals, but also strong links of uranium-234 with both humic acids and fulvic acids form.
Organic substance as a collector of recoil atoms Th-234 (U-234) in black shales // Czechoslovak J.