Their attention seemed to be focused on the back yard of the house next door, specifically on a large wooden potting shed that abutted the chain-link fence dividing her property from her neighbor’s. Three of the men had donned ventilated moon suits and were proceeding to dismantle the potting shed with electric saws, stuffing the pieces of wood into large steel drums emblazoned with radioactive warning signs.
...
To obtain americium-241, David contacted smoke-detector companies and claimed that he needed a large number of the devices for a school project. One company agreed to sell him about a hundred broken detectors for a dollar apiece. (He also tried to “collect” detectors while at scout camp.)