Scientists at Idaho National Laboratory (INL) have developed a simple but important new tool that could make it much safer and faster to collect radioactive debris after a nuclear explosion.
Instead of building a completely new machine, the team created a special attachment that fits onto a commercial handheld vacuum cleaner, allowing investigators to safely gather tiny fallout particles for scientific analysis.
The project is designed for one of the most challenging situations imaginable.
After a nuclear explosion, intense heat melts nearby soil, buildings and other materials. As this material cools, it falls back to the ground as tiny beads of radioactive glass.
Most of these particles are smaller than one millimeter across, ranging from the size of a grain of sand to a poppy seed.
Although these particles are extremely dangerous because of their radioactivity, they also contain valuable information. Scientists can study the material to determine details about the nuclear device that created it.
This type of analysis, known as nuclear forensics, helps investigators identify where the weapon came from and can play an important role in responding to a nuclear attack or deterring future threats.
Until recently, collecting these samples was surprisingly basic. During training exercises, specialists often used a broom, dustpan and an ordinary battery-powered vacuum cleaner. After collecting the debris, they had to carefully remove it from the vacuum by hand and transfer it into evidence containers, a process that was slow, awkward and increased the risk of contamination.
To solve this problem, researchers at INL designed a lightweight attachment that fits onto certain cordless handheld vacuums.
As the vacuum collects particles, they are trapped inside a removable plastic specimen container rather than entering the vacuum itself. A special filter allows air to pass through while preventing radioactive material from reaching the motor. The design also includes a one-way valve and a system that helps capture even very fine particles.
The idea was developed quickly, with the first prototype produced on a 3D printer in 2017. Since then, the team has continued improving the design based on feedback from training exercises.
One of the biggest goals was making the attachment strong enough for field use while also keeping it easy to assemble, even when responders are wearing bulky protective clothing.
The improvements have made a noticeable difference. Tasks that once took about 15 minutes can now be completed in roughly five minutes, allowing emergency teams to work more efficiently while spending less time in hazardous areas.
The United States has a dedicated nuclear forensics program involving several government agencies, including the Department of Energy, the FBI and the Office of the Director of National Intelligence, working together with scientists from national laboratories.
If a nuclear incident ever occurred, these experts would quickly collect evidence, analyze the radioactive material and provide information to national leaders about the likely source of the attack.
Although the vacuum attachment is a relatively simple invention, it could become an important part of that effort. Researchers are continuing to test and refine the design using safe materials that closely resemble radioactive fallout. They also conduct specialized training with short-lived radioactive materials to make the exercises as realistic as possible.
The team is now completing the final improvements before beginning small-scale production.
If the device is ever needed in a real emergency, it will provide investigators with a faster, safer and more reliable way to collect the tiny pieces of evidence that could help reveal who carried out a nuclear attack.
