Carbon dating of the turin shroud
The Shroud has attracted widespread interest ever since Secondo Pia took the first photograph of it in 1898: about whether it is Jesus' purported burial cloth, how old it might be, and how the image was created.
According to radiocarbon dating done in 1988, the cloth was only 728 years old at the time.
The results match those of conventional carbon dating techniques, they say.
Any material of plant or animal origin, including textiles, wood, bones and leather, can be dated by its content of carbon-14.
Now Carpinteri's team, through mechanical and chemical experimentation, hypothesizes that high-frequency pressure waves generated in the Earth's crust during earthquakes are the source of such neutron emissions.
This is based on their research into piezonuclear fission reactions, which are triggered when very brittle rock specimens are crushed under a press machine.
Other researchers have since suggested that the shroud is much older and that the dating process was incorrect because of neutron radiation – a process which is the result of nuclear fusion or nuclear fission during which free neutrons are released from atoms – and its interaction with the nuclei of other atoms to form new carbon isotopes.
However, no plausible physical reason has yet been proposed to explain the origin of this neutron radiation.