Midori Naka (仲みどり; 19 June 1909 – 24 August 1945) was a Japanese stage actress of the Shingeki style. She initially survived the atomic bombing of Hiroshima on 6 August 1945, but died 18 days later. She was the first person in the world whose death was officially certified to be a result of radiation poisoning. Her notability helped publicize the adverse effects of exposure to radiation and encouraged more research on this area.
Source: “Midori Naka”, English Wikipedia (CC BY-SA 4.0), excerpt