Unless you picked up 1.2 Rem you were no where near 3x what you get from natural sources. I haven’t looked at your data but that would be well in excess what you are allowed to get as a non-rad worker. Be careful when you start measuring your dose as to what you put out there. Just FYI….do a search, an average person in the US gets ~300 mrem per year from naturally occurring sources,(radon, cosmic, food, other people, medical, dental, fallout, etc…)
Cool project.