Radiation Chamber

How it works: Use the reactor's controls to set the number of protons and neutrons and start the observation. Depending on its stability, the nucleus emits alpha, beta, or gamma radiation — toward all eight detectors at once, which then appear along the screen edges. Alpha radiation occurs mainly in very large atomic nuclei, and almost always above 83 protons. Each detector is randomly assigned to look for a specific type of radiation. For each gate just before a detector, choose the matching shielding material: paper stops only alpha, aluminum additionally stops beta, lead additionally stops gamma. The isotope is only discovered once every detector receives exclusively the radiation it's looking for.