The world's oldest monastery plans to use high-tech cameras to shed new light on ancient Christian texts preserved for centuries within its fortress walls in the Sinai Desert.

St. Catherine's Monastery hopes the technology will allow a fuller understanding of some of the world's earliest Christian texts, including pages from the Codex Sinaiticus, the oldest surviving Bible in the world.

The technique, known as hyperspectral imaging, will use a camera to photograph the parchments at different wavelengths of light, highlighting faded texts obscured by time and later writings.

It should allow scholars to understand corrections made to pages of the Greek Codex Sinaiticus, written between A.D. 330 and 350 and thought to be one of 50 copies of the Scriptures commissioned by Roman Emperor Constantine.

"If you look at all the corrections made by each scribe, then you can come out with a principle on which he was correcting the text," monastery librarian Father Justin said.

In a joint project with the monastery, libraries in Britain, Germany and Russia, which together hold the bulk of the manuscript, will also scan pages and fragments of the text to digitally reunite the work in a facsimile.

The monastery had kept the Codex Sinaiticus until the mid-19th century, when the bulk of it was taken to Russia by a German scholar and never returned. Russia sold those pages in 1933 to the British Library, where they are still kept.

The monks thought they had lost the entire manuscript to Europe until 1975, when they discovered 12 of its pages and 15 fragments in a forgotten chamber, buried under a collapsed ceiling with thousands of other parchment leaves and fragments.

The monastery, which has never lost hope that the manuscript may return, has agreed to take part in the project on the condition that it include a modern history of the Codex.

The Greek Orthodox monks keep a framed copy of a note left by the German scholar promising to return the manuscript. Unpublished documents in Russian archives could shed light on the circumstances in which the text left the monastery.

Russia might have a document showing that the monks sold or donated the Codex. But questions would remain on whether any such document was obtained under duress, Father Justin said.

"If they find such a document, maybe in their archives, then we must accept it. If not, we have rights. But even if there is such a document, how was it obtained?" St. Catherine's Archbishop Damianos said.

Pages of the Codex Sinaiticus in Britain and Germany are in good enough condition to be photographed, but those in the monastery need to be restored first.

"Some of them are crumpled in the state they were found in, and they need to be opened up," said book historian Nicholas Pickwoad, an adviser to the monastery's conservation project.

The monastery plans to build a conservation workshop to treat the Codex and other works in its collection of 3,304 manuscripts and 1,700 scrolls, which make up the biggest collection of early Christian texts outside the Vatican.

It will also build a library to house the collection, preserved by the monastery's remote location, a dry desert climate and the care of the monks. "There is nothing else quite like this collection. It doesn't compare," Pickwoad said.

Hyperspectral imaging will be used to read another of the monastery's most significant manuscripts, the Codex Syriacus.

The technology should allow scholars to read the faint remnants of a washed-out 5th-century text that lie under visible 8th-century writing. The underlying text in Syriac is a copy of a 2nd-century translation of the New Testament Gospels.

In the late 19th century, scholars applied chemicals to the manuscript that briefly made the underlying text visible but made the parchment more brittle. "It's almost certain that the whole text has not been extracted yet," Pickwoad said.

Photographing the rippled parchment may involve using up to "four cameras taking images from different angles and then knitting the image together, electronically pulling it flat because we may not be able to pull it flat physically," he said.

The technology also could be applied to read the faint traces of a script in a language that has not been seen elsewhere except carved in a few stone inscriptions. It lies in the pages of a Georgian manuscript dating to the 8th or 9th century.

Father Justin, who is from Texas, has started digitizing some of the monastery's best-preserved manuscripts using a camera that can take photos up to a resolution of 72 megapixels.

"When I came to Sinai, I came to live in the desert. I didn't know I'd be doing computer photography and going to London four times a year," he said.

The monastery aims to have 100 manuscripts photographed and accessible through a Web site by the middle of next year. "Even though it's only 100 out of 3,000, it will be an important scholarly resource," Father Justin said.

Book historians are cataloguing the condition of the manuscripts and the physical features of their bindings, 50 percent of which are original.

"The evidence of where a manuscript has been and where it has come from to get here is often in the binding," Pickwoad said.

Conservators are even keeping the dust they brush from the manuscripts in a search for traces of pollen or seeds that may yield evidence of how texts in languages including Persian, Amharic and Hebrew made it to the middle of the Sinai Desert.

The project by St. Catherine's Monastery, shown on the left, includes photographing pages from the Codex Sinaiticus, a copy of the Scriptures written between A.D. 330 and 350.Father Justin looks at an ancient text at the monastery, whose 3,304 manuscripts and 1,700 scrolls make up the biggest collection of early Christian texts outside the Vatican.Father Justin loads a manuscript onto a cradle designed for photographing manuscripts at different wavelengths of light, highlighting texts obscured by time and later writings.A digital photograph at the monastery shows John VIII Palaeologos, a Byzantine emperor from the early 15th century.