Google dedicated a doodle to Stefania Mărăcineanu on her 140th birthday on Saturday.
She is a pioneering woman in radioactivity discovery and research.
Stefania Mărăcineanu earned a degree in physical and chemical sciences in 1910.
She began her career as a teacher at Bucharest's Central School for Girls.
She chose to do graduate work at the Radium Institute in Paris.
Under the direction of physicist Marie Curie, the Radium Institute quickly became a global centre for the study of radioactivity.
Mărăcineanu began work on her PhD thesis on polonium, an element discovered by Curie.
Mărăcineanu discovered that the half-life of polonium appeared to be dependent on the type of metal it was placed on during her research.
This made her wonder if the polonium's alpha rays had converted some of its atoms into radioactive isotopes.
Her investigation resulted in what is most likely the first instance of artificial radioactivity.
Today's Doodle celebrates the 140th birthday of Stefania Mărăcineanu and pays tribute to her legacy.