Believe it or not, in the years 1950-1951, the A. C. Gilbert Company distributed the Gilbert U-238 Atomic Energy Lab, a toy kit allowing kids to make nuclear reactions at home using actual radioactive material. It was taken off the shelves in 1951 
Discussion
You always share some of the best trivial history topics, I just looked up this, apparently a little more details on it being taken out of production. The price of it was $50 in 1950 about the equivalent to $600 these days and it required an older demographic of youth than the company’s normal target market. Apparently the actual radioactive materials were only about as harmful as normal UV exposer from the sun as long as the kids followed the safety warnings and didn’t open the sealed components