Radioactive toys for kids? Hell yes! In 1947 these Kix Lone Ranger Atomic Bomb rings were all the range.
For .15 and a box top you could have your own wearable spinthariscope. The advertising claimed you could see atoms smashing themselves to smithereens inside this ring. It also declared the action perfectly safe. The polonium alpha particles were smashing against a zinc screen.
The half-life of the polonium was super short. My ring does not work. Hell, it can even be a real pain in the posterior removing those red plastic fins, just so you can see the "reaction chamber."
I like it.