The [alpha]-rays and the [alpha]-particle : a study of ionization and allied phenomena produced by [alpha]-rays
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As a result of experiments by M. Henri Beoquerel in 1896 we now know a certain class of chemical elements as Radio-active. A radio-active body gives off radiations that have the following effects: 1) they will affect a photographic plate; 2) they will excite phosphorescence in some substances; 3) the rays will ionize a gas thru which they pass. The study of the last and most important property has contributed most of our knowledge of radio-activity.