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Stephen Chen

Chinese military scientists have released the field test results of a rare simulated “dirty bomb” attack, showing the potential of a novel defence method that could stop nuclear fallout before it spreads.
The research, conducted by the Joint Logistic Support Force University of Engineering and the Rocket Force Research Institute, explores how an advanced airborne system similar to weather modification could rapidly suppress and contain deadly radioactive smoke clouds after a radiological explosion.
A dirty bomb is not a nuclear weapon in the traditional sense. It does not cause a nuclear chain reaction or a massive atomic explosion like those seen in Hiroshima or Nagasaki.
Instead, it combines conventional explosives with radioactive materials such as plutonium or caesium. When detonated, it scatters radioactive dust and smoke over a wide area – creating a hazardous “radioactive plume” that contaminates buildings, roads and air.
This makes dirty bombs an ideal tool for terrorism with the goal of producing fear, disruption and long-term contamination.
“Mobile, rapidly deployable aerial suppression systems currently under development can quickly implement high-altitude, wide-area suppression of explosion-generated smoke clouds immediately after detonation,” wrote the project team led by Lin Yuanye, a nuclear emergency expert with the Joint Logistic Support Force.
“By releasing suppression agents that interact with radioactive aerosols through mechanisms such as adsorption, clustering and coagulation, these systems can significantly accelerate the in situ or near-source deposition of hazardous particles,” Lin and his colleagues added.


This study, which appeared in the Chinese Journal of Safety and Environment in October, comes at a time of growing global nuclear anxiety.
Russia has just tested the Burevestnik, a nuclear-powered cruise missile designed to fly indefinitely, and Poseidon, a giant nuclear-armed underwater drone capable of destroying coastal cities.
US President Donald Trump has repeatedly said in recent weeks that the US would resume nuclear testing to counter China’s expanding nuclear arsenal, although the US stockpile remains far bigger.
The People’s Liberation Army researchers modelled a scenario with explosives equivalent to 62kg (136lbs) of TNT triggering the dispersal of 1kg of weapons-grade plutonium – extremely dangerous material used in nuclear warheads.
They ran high-fidelity computer simulations, backed by data collected in a real-world simulation test to ensure accuracy.
To minimise unpredictable weather effects, the test was conducted during a calm, overcast evening with wind speeds under 2 metres per second (7.2km/h or 4.5mph).
The explosion occurred on a hard concrete surface, mimicking urban infrastructure. The air temperature was about 25 degrees Celsius (77 degrees Fahrenheit), typical for mild climates.

To track the smoke cloud, scientists used tracer dyes – non-radioactive substances that behave like radiation – to visualise the spread.
A high-altitude balloon was launched alongside the blast to help calibrate the vertical height of the rising plume, while laser rangefinders and angle-measuring instruments provided precise spatial data.
Finally, specialised image analysis software processed video and photos to extract exact time-and-space data on how the cloud moved and expanded.
This combination of real-world testing and computer modelling ensured highly accurate predictions.
The simulation showed that if left unchecked, just one dirty bomb could create a radioactive contamination zone covering nearly 10 sq km (3.8 square miles) – potentially affecting tens of thousands of people.
This includes dangerous levels of radiation across multiple zones including a “lethal zone” with radioactive doses higher than 1 Sievert, which means risk of death; a “hazard zone” (500 mSv–1 Sv) with severe health impacts and an “intervention zone” that requires evacuation and clean-up.
The researchers proposed using rocket-launched suppression systems, much like those used in cloud-seeding operations where chemicals are injected into clouds to trigger rainfall.


In this case, the rockets would carry special suppression agents into the upper atmosphere within minutes of the explosion, targeting the rising radioactive plume.
Chemicals can stick to radioactive particles, forcing tiny aerosol particles to clump together. As clumps become heavier, they fall out of the air faster.
This causes the radioactive smoke to drop to the ground near the blast site instead of being carried by the wind.
The team calls this approach “high-altitude rapid-response suppression”.
The method can be extremely effective if done quickly and efficiently, according to the simulation results.
“When the suppression efficiency exceeds 50 per cent, high-risk zones such as intervention and rescue areas are reduced to very small extents. When suppression efficiency reaches 90 per cent, these two zones almost completely disappear,” according to Lin’s team.
But to achieve 90 per cent suppression, the rockets must launch within about two minutes of the explosion. Any delay and the plume rises too high and spreads too far.
That places enormous demands on early warning systems, detection networks and emergency response speed – all core capabilities for any modern military or civil defence force.
The study suggests permanent suppression rocket bases should be stationed around sensitive sites including major cities, military installations and, critically, China’s coastal nuclear power plants.
With more than 100 nuclear reactors in operation or under construction along densely populated coastlines, a serious incident – whether from terrorism, natural disaster or conflict – could lead to a Chernobyl- or Fukushima-style catastrophe.
As the current study focused on dirty bombs, it remains unclear whether this method would work on true nuclear explosions, which produce much hotter, larger and higher-reaching mushroom clouds than dirty bombs.
Though the risk of a hot war between major nuclear powers remains relatively low, nuclear fallout suppression technology offers a potential first line of defence, capable of containing radiation before it becomes an unstoppable crisis, according to Lin’s team.
“It is of great significance for gaining strategic initiative in battlefield nuclear safety and winning international public support,” they added.


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China

China’s weather modification tech can help fight radioactive fallout, study finds


China’s weather modification tech can help fight radioactive fallout, study finds.


Nuclear weapons and intercontinental ballistic missiles (ICBMs)

War and conflict

Defence

Terrorism

PLA team simulates ‘dirty bomb’ fallout in rare field test as nuclear tension heats up

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}China’s weather modification tech can help fight radioactive fallout, study finds

China’s weather modification tech can help fight radioactive fallout, study finds