Endless Facts, One Snippet at a Time
The Discovery of Radioactivity Explained Simply
- In 1896, Henri Becquerel discovered radioactivity while studying phosphorescent uranium salts.
- He noticed photographic plates fogged even without sunlight, proving uranium emitted invisible rays.
- These mysterious rays were different from X-rays, discovered only a year earlier.
- Marie and Pierre Curie expanded Becquerel’s work, coining the term radioactivity.
- They discovered new radioactive elements, polonium and radium, in 1898.
- Radioactive materials release energy from the nucleus, not just from chemical reactions.
- Early experiments showed radioactivity could penetrate solids and ionize air.
- At first, scientists thought radiation might be useful in medicine—and radium was added to tonics and products.
- Later, they realized the serious health risks of long-term radiation exposure.
- Today, radioactivity is harnessed safely in medicine, energy, and research—thanks to these early pioneers.