How to Xray a Volcano

[Mal12345]

http://dvice.com/archives/2012/01/cosmic-ray-muon.php

In order to predict when a volcano is going to erupt, and how bad that eruption is going to be, it's helpful to have a picture of what's going on deep down inside the thing. Seeing as we don't have any volcano-sized x-ray tables lying around, scientists have simply started using the entire universe, and the cosmic rays that it produces, as an imaging system.

 

[Lateralus]

It sounds like they're using muons (which are leptons), not x-rays/photons (which are bosons).

 

[Mal12345]

It sounds like they're using muons (which are leptons), not x-rays/photons (which are bosons).

Yes, the article says they are muons. But there is no other name for this procedure.

What's a photon scanner? You mentioned x-rays/photons.