This can be done at home with a little effort. Less effort if you can get dry ice easily. https://hackaday.com/2019/01/13/see-the-radioactive-world-with-this-p

This can be done at home with a little effort. Less effort if you can get dry ice easily. https://hackaday.com/2019/01/13/see-the-radioactive-world-with-this-peltier-cloud-chamber/ https://hackaday.com/2019/01/13/see-the-radioactive-world-wi...