A randomized, double-blind, sham-controlled trial comparing two screening devices for radiation contamination.

Area of Science:

• Emergency Medicine
• Radiation Detection Technology
• Public Health Preparedness

Background:

• Mass casualty incidents involving radioactive contamination require effective screening methods.
• Traditional Geiger counters are widely used for radiation detection.
• Newer radiation detection portals offer potential for rapid, large-scale screening.

Purpose of the Study:

• To compare the screening performance of a novel radiation detection portal against a traditional Geiger counter.
• To evaluate the sensitivity and specificity of both devices in a simulated mass casualty scenario.

Main Methods:

• A mass casualty training exercise was conducted with 30 volunteers.
• Volunteers were randomly assigned gowns with sham or cesium-137 samples.
• Screening was performed using both a Geiger counter and a radiation detection portal.

Main Results:

• Geiger counter screening achieved 100% sensitivity in detecting radioactive samples.
• The radiation detection portal showed a sensitivity of 70.5%, with a 29.5% false-negative rate.
• Both devices exhibited 100% specificity, correctly identifying all sham (non-radioactive) samples.

Conclusions:

• Geiger counters are more sensitive than radiation detection portals for identifying radioactive contamination in mass casualty drills.
• Radiation detection portals require further development to improve sensitivity for effective deployment.