"But not all Ikariots enjoy the same degree of longevity. Data from the ongoing study shows that people living in the northern part of the island outlive those inhabiting the southern part, and therein lies the mystery. Presumably southern Ikariots have no significant dietary differences from their northern counterparts—nor would genetics make sense, since there’s little chance of finding genetically isolated populations on a small island. That’s why some experts have proposed one possible reason for this discordant longevity—geology"
The north and northwest of the island are predominated by granite rocks, which naturally contain trace amounts of uranium and are known to emit very low doses of gamma radiation, between 0.20 and 3.31 millisievert annually—somewhere in between the amount of radiation you would absorb from a single chest X-ray and a more-powerful CT scan.
“To the south of the island, on the contrary, limestone predominates,” says Christodoulos Stefanadis, professor of cardiology at the National University of Athens and the Ikaria study’s head researcher. Statistically, people in the north of the island live significantly longer than those to the south. In 2001, the northern part of the island had 11 male and 22 female nonagenarians and centenarians out of a total of 1,452 male and 1,359 female inhabitants—whereas only five out of 1,691 men and 19 out of 1,710 women were over 90 in the southern part.
Stefanadis says this appears to be tied to the excess in gamma rays in the north, which are between 0.20 and 3.31 millisievert annually (over and above a universally “normal” amount of gamma rays would be about 1 to 2 millisievert per year). “This radiation difference is an independent prognostic factor of longevity,” Stefanadis says, though he is quick to add there is not enough evidence to confirm this definitively, simply because the question has not been properly investigated.
The north and northwest of the island are predominated by granite rocks, which naturally contain trace amounts of uranium and are known to emit very low doses of gamma radiation, between 0.20 and 3.31 millisievert annually—somewhere in between the amount of radiation you would absorb from a single chest X-ray and a more-powerful CT scan.
“To the south of the island, on the contrary, limestone predominates,” says Christodoulos Stefanadis, professor of cardiology at the National University of Athens and the Ikaria study’s head researcher. Statistically, people in the north of the island live significantly longer than those to the south. In 2001, the northern part of the island had 11 male and 22 female nonagenarians and centenarians out of a total of 1,452 male and 1,359 female inhabitants—whereas only five out of 1,691 men and 19 out of 1,710 women were over 90 in the southern part.
Stefanadis says this appears to be tied to the excess in gamma rays in the north, which are between 0.20 and 3.31 millisievert annually (over and above a universally “normal” amount of gamma rays would be about 1 to 2 millisievert per year). “This radiation difference is an independent prognostic factor of longevity,” Stefanadis says, though he is quick to add there is not enough evidence to confirm this definitively, simply because the question has not been properly investigated.
https://proto.life/2021/11/ikaria-the-island-of-mysterious-l...