Who were the Radium Girls and how did they die ?

they were female factory workers in 1910's-1920's and died to radiation poisoning due to painting watch dials with radium-laden paint

Explanation:

The Radium Girls were female factory workers who contracted radiation poisoning from painting watch dials with self-luminous paint. The painting was done by women at three different factories, and the term now applies to the women working at the facilities: one in Orange, New Jersey, beginning around 1917; one in Ottawa, Illinois, beginning in the early 1920s; and a third facility in Waterbury, Connecticut. They died by ingesting the poison when told they had to point the brushes on their lips to give it a finer tip. Explanation:

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