Researchers Propose New Way of Detecting Concealed Radioactive Material

Researchers at the University of Maryland have proposed a scheme for detecting a concealed source of radioactive material without searching containers one by one. Detection of radioactive material concealed in shipping containers is important in the early prevention of "dirty" bomb construction. The concept, described in the Journal of Applied Physics, is based on the gamma-ray emission from the radioactive material that would pass through the shipping container walls and ionize the surrounding air.

The facilitated breakdown of the air in a focused beam of high-power, coherent, terahertz or infrared radiation would then be an indicator of the presence of the radioactive material. The gamma rays coming through the container walls could be detected by a pulsed electromagnetic source of duration between 10 ns to microseconds.

The team evaluated several candidate sources for this detection, including a 670-GHz gyrotron oscillator with 200-kW, 10-µs output pulses and a TEA CO2 laser with 30-MW, 100-ns output pulses. A system based on the 670-GHz gyrotron would have enhanced sensitivity and a range exceeding 10 m.

  • Securing Entertainment Venues Securing Entertainment Venues

    One thing entertainment venues, sports stadiums and theme park officials want to accomplish is getting people back into their seats. That is happening today—but not without understanding and technology. In this episode, AJ DeRosa shares his insight on how COVID-impacted businesses are able to face safety and security issues with confidence and technology. We also discuss visitor expectations and how venue officials can ensure their space is secure as they welcome visitors back.

Digital Edition

  • Security Today Magazine - July August 2021

    July August 2021

    Featuring:

    • Tee Up the Security
    • Listen Clearly
    • Turning to the Cloud
    • COVID-19 The Final Push
    • Redefining Security

    View This Issue

  • Environmental Protection
  • Occupational Health & Safety
  • Infrastructure Solutions Group
  • Spaces4Learning
  • Campus Security & Life Safety