delta ray

noun

(physics) An electron ejected by recoil when a rapidly moving alpha particle or other charged particle passes through matter.

The delta ray is a type of ionizing radiation.

意味（1）

(physics) An electron ejected by recoil when a rapidly moving alpha particle or other charged particle passes through matter.

意味（2）

(physics) A secondary ionizing particle ejected by recoil when a primary particle passes through matter.