Im in my last year in high school and i need to work on a physic project, So basically i need to find myself a subject and a experiment to do. My problem is that i need some inspiration or examples. Last year i had a project like it and i tried to find out what kind of radon isotope that is emitting from the concrete floor in our classroom, so i used a vacuum for collecting the dust sucking it into a sponge and afterwards trying to calculate the decay time and see what kind of radon isotope it would fit with. So i need examples of experiments like that or some kind of other experiment. I know its not the regular homework help thread but i hope someone will help me anyway.