A 25 mm thick plywood sheet is placed between the radiation source and the detector. What radiation can pass

A 25 mm thick plywood sheet is placed between the radiation source and the detector. What radiation can pass through it? 1) alpha and beta 2) only beta 3) beta and gamma 4) only gamma

The answer to this question will be the answer number 4) only gamma.

Indeed, only she scale will pass through the given obstacle and hit the target.

Nothing else can handle it.

And the point here is what exactly prevents other elements from getting inside.

We are quite capable of stopping the alpha radiation with this simplest sheet of plywood. It won’t work.

Beta radiation will delay the plexiglass. So it turns out that it won’t go anywhere either.

But gamma radiation in this case will not delay anything.