This is a cloud chamber that can display radioactive materials in a supersaturated alcohol vapor. Here's how I built it and what it tells you. PCBWay: https://www.pcbway.com/?from=rclifeon PCBWay offers PCB manufacturing, 3D printing and CNC services. Thermoelectric coolers: https://www.electron.com/ Discount code for 10%: ELEC10 Music: Nysno - Sandra Marteleur The Washing Ladies - John Abbot Occurrence - Martin Gauffin City Phases - John Abbot