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Deltastrahl v
biol.	delta-ray; delta track; δ-track; delta-particle track; δ-particle track
hi.energ.	delta ray; δ-ray; delta; delta-electron (δ); δ-electron; delta particle; δ-particle; knocked-on electron; knocked-on particle; knock-on
nucl.phys., радиоакт.	delta-electron