Henri Becquerel’s Discovery of the Glow of Radioactive Materials


In 1896 French scientist Henri Becquerel was working with radioactive substances and found that under ultraviolet light, these elements began to glow. Becquerel left radioactive uranium salts overnight on a photographic plate which had never been exposed to light. The next day a dark shadow emerged which Becquerel realized was the markings of energy, radioactive energy and therefore discovered radioactivity