In lieu of spending a fair bit of money on dedicated muon detectors, you can also hack such a device together with two Geiger-Müller tubes and related circuitry for about $100 or whatever you can ...

With this portable x-ray machine, [Grenadier] has begun overloading Geiger counters. We’re just happy ... in action – one showing the inside of a pen and the guts of a hard drive (as shown ...