This conflicted with views which held that no mineral should be more radioactive than metallic uranium. Other scientists began experimenting with X-rays, which could pass through solid materials. One of the hypotheses put forward at the beginning of our research by Pierre Curie and myself consisted in assuming that the radiation is an emission of matter accompanied by a loss in weight of the active substances and that the energy is taken from the substance itself whose evolution is not yet completed and which undergoes an atomic transformation. She wanted to learn more about the elements she discovered and figure out where they fit into Mendeleevs table of the elements, now referred to as the periodic table. Elements on the table are arranged by weight. In 1905, an amateur Swiss physicist, Albert Einstein, was also studying unstable elements. As the specific activity of a substance is, in the case of analogous radiations, approximately in inverse proportion to the average life, the result is that if the average life is very brief, the radioactive reaction can attain an unprecedented sensitivity. This discovery was an important step along the path to understanding the structure of the atom. He was also a professor at Sorbonne. Experiments conducted on polonium have supplied a first value for this number, which is in good agreement with the values obtained by other methods.
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