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When he looked more carefully, he noticed that the film had lots of patches on it, and that this did not happen when other elements were placed on the paper.

He eventually concluded that some rays must be coming out of the uranium crystals to produce this effect.

Uranium is radioactive whether it is in the form of an element or compound.

In addition, radiation does not vary with temperature, pressure, or ionization state of the uranium atom.

She was active in research almost until her death in 1934.

Becquerel found radiation to be associated with certain elements, such as uranium.This means that rays carry energy, but pitchblende emits them continuously without any energy input.This is an apparent violation of the law of conservation of energy.Over four years, working under poor conditions and spending their own funds, the Curies processed more than a ton of uranium ore to isolate a mere gram of radium salt.Radium became highly desirable because it was about two million times as radioactive as uranium.

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