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Here he discovered radioactinium and conducted investigations with Rutherford on alpha-rays of radiothorium and radioactinium.
All alpha-rays are positively electrified atoms of the element helium, which thereby is shown to be an integral constituent of many elements.
The alpha-rays from radio-active substances are swarms of tiny meteors flying at the incredible speed of twelve thousand miles a second, while the meteors of the midnight sky fly at the speed of only forty miles a second.
Taking his stand on the discovery of the material nature of the alpha-rays by the Nobel Prizeman Rutherford, he further laid down, by way of explanation of the mutual genetic connection between the elements, the proposition that every loss of an alpha-particle involves a shifting of the element in question two vertical columns to the left from its original place in the System: a proposition which was later supplemented by someone else to the effect that each loss of a beta-particle involves a shifting of one vertical column to the right.
233U, which gives off alpha-rays and has a half-period of 120,000 years.