"We believe it is possible that neutron emissions by earthquakes could have induced the image formation on the Shroud's linen fibres, through thermal neutron capture on nitrogen nuclei, and could also have caused a wrong radiocarbon dating," said Prof Carpinteri.
http://www.independent.co.uk/news/science/turin-shroud-could-earthquake-dating-back-to-time-of-jesus-solve-the-mystery-9123727.html http://www.independent.co.uk/news/science/turin-shroud-could-earthquake-dating-back-to-time-of-jesus-solve-the-mystery-9123727.html
