Conversation so far:
What was the critical accident that affected Louis Slotin?
Louis Slotin accidentally began a fission reaction, which released a burst of hard radiation.
How bad was Louis Slotin's radiation injury?
Louis Slotin was rushed to the hospital.
Did Louis Slotin recover from his radiation injury?
Louis Slotin died nine days later.
When did Louis Slotin die?
Louis Slotin died on 30 May.
Any other interesting aspects about the Louis Slotin article?
As soon as Louis Slotin left the building, he vomited, a common reaction from exposure to extremely intense ionizing radiation.

Question: What other symptoms did he have?
Self-contained rewrite: What other symptoms did Louis Slotin have from his accident, besides vomiting?