His was the first use of radioactive tracers - now routine in environmental science.Scientists continue to find new and beneficial ways of using nuclear technology to improve our lives.
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To try and confirm his suspicions de Hevesy put a small amount of radioactive material into the remains of a meal.
Several days later when the same dish was served again he used a simple radiation detection instrument - a gold leaf electroscope - to check if the food was radioactive.
In our daily life we need food, water and good health.
Radioisotopes play an important part in technologies that provide us with these basic needs.
The first power station to produce electricity by using heat from the splitting of uranium atoms began operating in the 1950s.