Hello. We are elementary school kids who built a cloud chamber for our science project to test out the effectiveness of different shields against background radiation. We are not sure about something involving beta-particles. Can you help us please? We know low-energy beta particles cannot penetrate the glass of our fish tank chamber, so they must already be present in the air trapped inside our chamber...but what about high-energy beta particles? We think we are seeing some medium length, bending particles (not muons) entering our chamber from the outside that look like high-energy betas. Is that possible? We want to understand this for sure because it will help us know how to best set up our different shields to try and block or interfere with the particles. Thanks!