In the 1970s I had an Edmund Scientific cloud chamber kit that included uranium ore and radium paint samples. It also needed dry ice to work. I recall getting s

In the 1970s I had an Edmund Scientific cloud chamber kit that included uranium ore and radium paint samples. It also needed dry ice to work. I recall getting some from a place that supplied ice cream trucks. I set it up for a school science fair. No one seemed bothered about it.