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To determine year of birth, the researchers focused on tooth enamel.

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Over the past six decades, the amount of radiocarbon in people or their remains depends heavily on when they were born or, more precisely, when their tissues were formed.

Forensic anthropologists at The University of Arizona took advantage of this fact in a recent study funded by NIJ.

There might have been a settlement around the castle or the surrounding areas in previous periods, the head of Istanbul Archeology Museums Zeynep Kızıltan said.

The excavation works in Aydos Castle, which consists of an area of approximately 26 to 27,000 square meters, have been carried out since 2016.

Unlike tooth enamel, soft tissues are constantly being made and remade during life.

Thus, their radiocarbon levels mirror those in the changing environment."The restoration of the castle has already been completed, but excavation works are still ongoing," he added.Prehistory is the period of human activity between the use of the first stone tools circa 3.3 million years ago and the invention of writing systems, the earliest of which appeared around 5,300 years ago.In contrast, from 1955 to 1963, atmospheric radiocarbon levels almost doubled.Since then they have been dropping back toward natural levels.All the people whose tissues were tested for the study were residents of the United States.