uraninite
— Noun
– English
～ a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
uranium 238
— Noun
– English
～ the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239
uranium 235
— Noun
– English
～ a uranium isotope with mass number 235; capable of sustaining chain reactions
uranium ore
— Noun
– English
～ any ore from which uranium can be extracted