In England and the United States, where physicists have at their disposal equipment of very high voltages, several new elements were prepared using protons and deuterons as projectiles. Frederic Joliot-Curie More Quotes by Frederic Joliot-Curie More Quotes From Frederic Joliot-Curie I have always attached great importance to the manner in which an experiment is set up and conducted ... the experiment should be set up to open as many windows as possible on the unforeseen. Frederic Joliot-Curie important science window We bombarded aluminum with alpha rays … then after a certain period of irradiation, we removed the source of alpha rays. We now observed that the sheet of aluminum continued to emit positive electrons over a period of several minutes. Frederic Joliot-Curie aluminum rays positive Some months ago we discovered that certain light elements emit positrons under the action of alpha particles. Our latest experiments have shown a very striking fact: when an aluminium foil is irradiated on a polonium preparation [alpha ray emitter], the emission of positrons does not cease immediately when the active preparation is removed: the foil remains radioactive and the emission of radiation decays exponentially as for an ordinary radio-element. We observed the same phenomenon with boron and magnesium. Frederic Joliot-Curie preparation light science The first unquestionable proofs of the transformation of elements into different chemical elements have been provided by the study of the phenomena of radioactivity. Frederic Joliot-Curie first transformation different study Astronomers sometimes observe that a star of medium magnitude increases suddenly in size; a star invisible to the naked eye may become very brilliant and visible without any telescope - the appearance of a Nova. Frederic Joliot-Curie naked eye appearance sometimes There is no doubt that radium is transformed spontaneously into an active gas, radon, emitting at the same time alpha particles, or helions. Frederic Joliot-Curie alpha same doubt time
