A 1896, Henri Becquerel gano cewa uranium salts emitted rays cewa kama X-haskoki a cikin penetrating ikon. Ya nuna cewa wannan radiation, sabanin phosphorescence, ba ya dogara a kan wani waje tushen makamashi amma ya zama kamar ya tashi spontaneously daga uranium kanta.
aiki na uranium mahadi ya dogara ne kawai a kan adadin uranium ba