Spinthariscopes were quickly replaced with more accurate and quantitative devices for measuring radiation in scientific experiments, but enjoyed a modest revival in the mid 20th century as children's educational toys.[5] In 1947, Kix cereal offered a Lone Ranger atomic bomb ring in exchange for a box top and 0.15 USD that contained a small one.[6][7][8] Spinthariscopes can still be bought today as instructional novelties, but they now use americium or thorium.