Could cosmic rays unlock the secret tomb of China’s Qin Shi Huang guarded by terracotta warriors?

Could cosmic rays unlock the secret tomb of China’s Qin Shi Huang guarded by terracotta warriors?

Cosmic rays may be used to scan the sealed tomb of China’s First Emperor — long rumoured to contain ᴅᴇᴀᴅly traps and an ancient map with liquid mercury rivers. Buried under a 249-feet-high pyramidal mound, the tomb lies within a necropolis in Xi’an’s Lintong District and is famously guarded by the Terracotta Army.

Found in their thousands to the tomb’s east, as if to protect Qin Shi Huang in death from the eastern states he conquered in life, each statue was once brightly painted. However, exposure to the dry Xi’an air before appropriate conservation techniques had been devised meant that most of the soldiers’ colours faded after recovery.

For this reason, Chinese officials have long been reluctant to allow the tomb itself to be unearthed until they can guarantee the preservation of any artefacts within. However, new proposals would see subatomic particle detectors placed beneath the 2,229-year-old tomb to map out the structure’s layout in three dimensions.

Qin Shi Huang (259–210 BCE) succeeded in conquering and unifying the whole of China in 221 BCE, creating an empire that lasted for some two millennia.

His other achievements including starting construction on the Great Wall of China, establishing a nationwide road network and standardising writing and units. 

His lavish burial site was unearthed in 1974 and has inspired both films and video games, including instalments in both The Mummy and Indiana Jones franchises.

Cosmic rays may be used to scan the sealed tomb of China’s First Emperor — long rumoured to contain ᴅᴇᴀᴅly traps and an ancient map with liquid mercury rivers
Buried under a 249-feet-high pyramidal mound (pictured), the tomb lies at the heart of a necropolis in Xi’an’s Lintong District, one famously guarded by the Terracotta Army
Found in their thousands to the tomb’s east, as if to protect Qin Shi Huang in death from the eastern states he conquered in life, each statue was once brightly painted. However, exposure to the dry Xi’an air before appropriate conservation techniques had been devised meant that most of the soldiers’ colours faded after recovery — as seen in the examples pictured
For this reason, Chinese officials have been reluctant to allow the tomb itself to be unearthed until they can guarantee the preservation of any artefacts within. Pictured: a map of the necropolis complex, which was modelled after the Qin capital Xianyang. The tomb mound can be seen in the centre of the image, with the inner and outer walls. The Terracotta Army was buried in a ‘garrison’ to the east, between the Emperor and the states he conquered
When high-energy cosmic rays (white line) from space interact with Earth’s atmosphere, they create a shower of subatomic particles — including some called ‘muons’ (solid orange lines) which form from the rapid decay of pions (solid yellow lines)

When high-energy cosmic rays from space interact with Earth’s atmosphere, they create a shower of subatomic particles, including some called ‘muons’. 

The scanning technique — ‘muon tomography’ — works as an X-ray, with detectors measuring the rate at which muons are absorbed by the material they pᴀss through.

Just as bones absorb relatively more X-rays than flesh to create contrast in a radiograph, so does stone and metal block the pᴀssage of more muons.

The same approach has previously been used, in 2017, to reveal the presence of a previously hidden, 98-feet-long chamber within the Great Pyramid at Giza.

The muon-scanning technique has been proposed by physicist Yuanyuan Liu of the Beijing Normal University and her colleagues, who normally use cosmic rays to investigate the dark matter at the China Jinping Underground Laboratory, which is the world’s deepest cosmic ray facility which is buried some 3.7 miles under the Sichuan province.

‘As an ancient civilisation with a long history, China has a large number of cultural relics that are in need of archaeological research,’ the team told the Times.

‘For the non-intrusive detection of the internal structure of some large artefacts such as imperial tombs, the traditional geophysical methods used in archaeology have certain limitations.

‘The application of muon absorption imaging to the archaeological field can be an important supplement to traditional geophysical methods,’ they concluded. 

To put their proposal to the test, the group used existing archaeological and historical data on the mausoleum to build models of the tomb complex.

They then buried these in the ground on top of two muon detectors to show that they could indeed images the chambers in their models.

‘Preliminary imaging results prove the feasibility of muon absorption imaging for the underground chamber of the mausoleum of the First Qin emperor,’ the team said. 

The feasibility studies were funded by the central Chinese government.

Based on their tests, the team have concluded that — to scan the real-life tomb — at least two muon detectors, each of which is about the size of a washing machine, would need to be placed in different locations within 328 feet (100 metres) of the tomb’s surface.

This is not the first time that archaeologists and other scientists have tried to use non-invasive methods to map out the inside of Qin’s tomb. Unfortunately, most approaches have limitations that make them difficult to apply to the mausoleum’s particular circumstances.

Gravity anomaly detectors are good at detecting changes in density underground — but such are easily affected by environmental disturbances and their range is limited to a small area.

Pictured: Qin Shi Huang (259–210 BCE), who succeeded in conquering and unifying the whole of China in 221 BCE, creating an empire that lasted for some two millennia

Ground-penetrating radar, meanwhile — a favourite of archaeological geophysicists — suffers from a too limited depth to be of much use here. 

These studies have succeeded in revealing, however, that an underground complex of some kind and state of preservation does extend some 98 feet beneath the pyramidal mound. Archaeologists believe that there is a good chance that the subterranean chambers may still be intact. Certainly, no evidence has been found that graverobbers have ever succeeded in tunnelling their way into the tomb.

Geophysicist Yang Dikun of the Southern University of Science and Technology in Shenzhen — who was not involved in the present study — told the South China Morning Post that the latest proposal to scan the Emperor’s tomb was feasible.

‘The muon detectors that we build and use for fieldwork nowadays have become so small they can be carried around by a child,’ he commented.

However, Dr Yang warned, the cosmic ray approach is not without potential challenges — the main one being that the detectors have to be physically emplaced underneath the mausoleum complex without damaging it or the artefacts within.

It also required considerable patience, he added. Unlike other imaging techniques, muon tomography is far from instantaneous, and the detectors will need to operate until they have racked up enough particle counts for meaningful analysis.

In fact, simulations by Dr Liu and her team have suggested that — to produce a clear image of the tomb’s structure — the detectors would need to be left in place for at least one year. The full findings of the study were published in the journal Acta Physica Sinica.

Related Posts

Roman Bath and Magnificent Mosaics Used as Stables by the Villagers For Many Years

Roman Bath and Magnificent Mosaics Used as Stables by the Villagers For Many Years

Roman Bath and Magnificent Mosaics Used as Stables by the Villagers For Many Years Archaeological excavations in the ancient city of Herakleia in Muğla’s Milas district in western Türkiye unearthed a striking discovery from the Roman period. Mosaics with detailed depictions of animals such as crocodiles, dolphins, flamingos, and eels were found on the floor of the …

Scientists identified a unique engraving that could be the oldest three-dimensional (3D) map in the world

Scientists identified a unique engraving that could be the oldest three-dimensional (3D) map in the world

Scientists identified a unique engraving that could be the oldest three-dimensional (3D) map in the world Scientists working in the Ségognole 3 cave, located in the famous sandstone mᴀssif south of Paris have identified a unique engraving that could be the oldest three-dimensional (3D) map in the world. A recent study published in the Oxford …

Golden Tongues and Nails discovered on mummies from the Ptolemaic Period in Egypt

Golden Tongues and Nails discovered on mummies from the Ptolemaic Period in Egypt

Golden Tongues and Nails discovered on mummies from the Ptolemaic Period in Egypt Archaeologists have uncovered tombs decorated with colorful inscriptions and ritual scenes, as well as unusual mummies and unique funerary objects, including 13 striking golden tongues and nails, at the Al-Bahnasa archaeological site in Egypt’s Minya governorate. The Oxyrhynchus Archaeological Mission, led by …

Sixth-Century Sword Unearthed in Anglo-Saxon Cemetery near Canterbury, England

Sixth-Century Sword Unearthed in Anglo-Saxon Cemetery near Canterbury, England

Sixth-Century Sword Unearthed in Anglo-Saxon Cemetery near Canterbury, England A spectacular sixth-century sword has been unearthed in an Anglo-Saxon cemetery in southeast England, and archaeologists say it is in an exceptional state of preservation and is similar to the sword found at Sutton Hoo, an Anglo-Saxon cemetery in Suffolk. The find was made in a …

2,000-Year-Old Unique Composite Fish Scaled Armor Found in Ancient Tomb

2,000-Year-Old Unique Composite Fish Scaled Armor Found in Ancient Tomb

2,000-Year-Old Unique Composite Fish Scaled Armor Found in Ancient Tomb Chinese researchers have recently found fish-scaled armor in the tomb of Liu He, Marquis of Haihun from the Western Han Dynasty (206 BC-AD 25), in Nanchang, the capital of eastern China’s Jiangxi province. According to the Provincial Insтιтute of Archaeology and Cultural Relics, this is …

Discovery Shedding Light on Ancient Maritime Trade: 1,500-Year-Old Trade Shipwreck Found off Türkiye’s Ayvalık

Discovery Shedding Light on Ancient Maritime Trade: 1,500-Year-Old Trade Shipwreck Found off Türkiye’s Ayvalık

Discovery Shedding Light on Ancient Maritime Trade: 1,500-Year-Old Trade Shipwreck Found off Türkiye’s Ayvalık ‘Turkish Sunken-Ships Project: Blue Heritage’, a 1500-year-old trade shipwreck was found off the coast of  Ayvalık district of Balıkesir. Under the direction of ᴀssociate professor Harun Özdaş, director of the Underwater Research Center (SUDEMER) at Dokuz Eylül University, the mapping of the underwater cultural …