The lagging ray, about to resign its ionising properties, becomes a much more efficient ioniser than it was at first.
"The Birth-Time of the World and Other Scientific Essays"
J. (John) Joly
For, in fact, some of the rays complete their work of ionising at points in the gas before the end is reached.
"The Birth-Time of the World and Other Scientific Essays"
J. (John) Joly
The explanation does not suggest that the ionising power of any one ray is actually diminished before it finally ceases to be an alpha ray.
"The Birth-Time of the World and Other Scientific Essays"
J. (John) Joly