The pictures are evidence that the nuclear “death ash” continues to emit radiation inside the human body even after 60-plus years, Kazuko Shichijo, an assistant professor at Nagasaki University, a member of the team, said.

The team’s success is the first of its kind in proving that atomic bomb victims were exposed to radiation from the inside as well as from outside.

“We have succeeded, from pathological perspectives, in proving that people were exposed to radiation internally,” Shichijo said.

The team studied anatomical samples of seven people in their 20s to 70s.