> but you’ll have to spend a lot of time to (legally) procure your own test sources. As @api mentioned elsethread, you can just buy isotopes from United Nuclea

> but you’ll have to spend a lot of time to (legally) procure your own test sources. As @api mentioned elsethread, you can just buy isotopes from United Nuclear: https://unitednuclear.com/index.php?main_page=index&cPath=2_5 https://unitednuclear.com/index.php?main_page=index&cPath=2_... You can also buy isotopes from other online scientific supply stores, but they're more of a hassle as they cater to business and institutional customers. In the U.S. I think most (all?) of them, including United Nuclear, are resellers for Spectrum Techniques (https://www.spectrumtechniques.com/about/ https://www.spectrumtechniques.com/about/), which is the commercial outfit working with the Oak Ridge National Laboratory to manufacturer and sell so-called exempt quantity isotopes. For most isotopes, including some really nasty ones like Polonium, Federal regulations permit unlicensed possession and sale under a certain quantity. A sample of Polonium for example (I have one on my desk right now), comes on the head of a pin. Building or even just buying and setting up an experimentation or display rig, like a cloud chamber, is much more of a hassle than acquiring the actual isotopes. I never did get around to building a cloud chamber; that sample of Polonium has never left my desk.