Electronic “Sniffer” Searches Out Nuclear Devices

Nov. 20, 2014
Engineers at Sandia National Laboratory have built a mobile imager of neutrons for emergency responders (MINER).
Sandia researchers pose with MINER, a portable device that can detect and pinpoint the source of neutron emissions from nuclear weapons.

The nightmare scenario for the Dept. of Homeland Security is a briefcase-sized nuclear weapon on the loose in a major U.S. city. To counter this potential threat, engineers at Sandia National Laboratory have built a mobile imager of neutrons for emergency responders (MINER). It is a portable neutron scatter camera that detects fast neutrons emanating from nuclear materials. It should let police forces pinpoint the source of the neutrons at significant distances and despite shielding.

MINER’s design is based on that of a larger scatter camera that stands 5 ft tall and requires a special power source. In contrast, MINER is about 3 ft tall and weighs 90 lb. Inside, 16 proton-rich liquid scintillator detector cells circle a large cylinder. Neutrons travel through the cells, bouncing off protons like ping pong balls. These interactions among the detector cells let the device calculate what direction those neutrons came from. Compared to other detectors, this technology lets MINER pick out the target radiation from background radiation and can measure the spectrum of neutrons being emitted. This lets it tell the difference between neutrons from plutonium, a threat, and americium-beryllium, a common commercial source of neutrons and not a threat. MINER also searches a 360° horizon. Other detectors have a narrow field of view and must be pointing in the source’s direction to pick it up.

MINER can be set up and operating in 10 minutes and uses battery power, which makes it more portable.

In a field test set in downtown Chicago recently, MINER found a sealed radiation source in 30 minutes. In fact, the device could scan an entire side of a skyscraper at one time, quickly narrowing the search down to a single room. When the source was shielded, the search took a few hours.

Sponsored Recommendations

The entire spectrum of drive technology

June 5, 2024
Read exciting stories about all aspects of maxon drive technology in our magazine.


May 15, 2024
Production equipment is expensive and needs to be protected against input abnormalities such as voltage, current, frequency, and phase to stay online and in operation for the ...

Solenoid Valve Mechanics: Understanding Force Balance Equations

May 13, 2024
When evaluating a solenoid valve for a particular application, it is important to ensure that the valve can both remain in state and transition between its de-energized and fully...

Solenoid Valve Basics: What They Are, What They Do, and How They Work

May 13, 2024
A solenoid valve is an electromechanical device used to control the flow of a liquid or gas. It is comprised of two features: a solenoid and a valve. The solenoid is an electric...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!