NIST researchers and international partners have used ultrasensitive quantum sensors to measure X-ray emissions from uranium, plutonium and neptunium with substantially improved precision. The measurements can help analysts separate those X-rays from overlapping gamma-ray signals used to identify and account for nuclear material.
Transition-edge sensors resolve overlapping signals
The work used arrays of transition-edge sensors, superconducting devices operated just above absolute zero. An incoming photon produces a measurable change in resistance, allowing the detector to determine its energy with high resolution. NIST reports that the new measurements reduced uncertainty by between one-third and one-eighth compared with earlier values.
More accurate X-ray data allows monitoring systems to subtract background interference and estimate isotope ratios more precisely. Those ratios are important for nuclear safeguards because they help distinguish material composition and enrichment.
Deployment still requires specialized infrastructure
The sensors need cryogenic cooling and are not handheld instruments. NIST says arrays can operate where sufficient power and refrigeration are available, while samples can also be sent to equipped laboratories. The technology may shorten measurement delays at nuclear facilities, but operational adoption requires calibration, chain-of-custody controls and validated procedures. SectechMedia follows related systems in its industrial monitoring coverage.
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