A year later — in 1896 — in Paris, Antoine Henri Becquerel made his discovery of the mysterious rays given off by uranium salts. Marie Curie asked his permission to go on with the experiments. Her desire was to find if any substances besides the salts of uranium gave off these rays. After many experiments she found that only one, the salt of thorium, did so. But the most amazing discovery she made was the fact that pitchblende, the ore from which uranium is obtained, gave off rays four times as strong as those of pure uranium.
Вот начало:
Год спустя - в 1896 году - в Париже, Антуан Анри Беккерель сделал свое открытие таинственных лучей, выделяемые соли урана.