In these figures we’re focusing in on the times when the tracer signals turn on.  There’s a delay of between 100 and 200 ps in the appearance of Ka absorption signals on the doped and undoped sides.  Note that you can also see the ionization balance moving toward higher stages (Be ® Li ® He) as time goes on.
Undoped
Doped with 1.5 % Germanium
Finally - the data