Both photons and particles can shift enough energy to to convert the absorber atoms to ions. Detect these ions and you'll have...

Physics Narrative 14-16

Fast-moving charged particles can rather easily shift energy to atoms and so strip electrons–that is, ionise the atoms. There...

Physics Narrative 14-16

An atom or molecule is ionised by having at least one electron stripped from it:

Physics Narrative 14-16

It is quite common to see statements along the lines of alpha particles are more ionising than beta , but this is not actually...

Teaching Guidance 14-16