Radiation measurements around X-ray cabinet systems.

Area of Science:

• Medical Physics
• Radiation Safety
• Airport Security Operations

Background:

• Airport security personnel operating X-ray units are typically not monitored for radiation exposure.
• Increased passenger screening due to security measures raises concerns about prolonged exposure to scattered X-ray radiation for these workers.

Purpose of the Study:

• To investigate the pathways of scattered X-ray radiation breaches near X-ray cabinet systems.
• To assess the impact of increased item inspection rates on radiation dose rates for security personnel.

Main Methods:

• Utilized active electronic dosemeters to detect and map scattered X-ray radiation.
• Monitored time-dependent dose rates in relation to passenger throughput and operational factors.
• Correlated dose rate fluctuations with specific security operational periods, such as rush hours.

Main Results:

• A strong correlation was found between time-dependent dose rates and the number of passengers undergoing security control.
• Increased dose rates during peak hours were attributed to scattered radiation escaping through inadequately closed lead curtains.
• Radiation doses at the entrance of the inspection tunnel were measured to be 50% higher than at the exit, reflecting the inherent design of X-ray cabinet systems.

Conclusions:

• Active electronic dosemeters are effective in identifying X-ray radiation breaches in airport security settings.
• Incomplete closure of lead curtains during high-traffic periods significantly contributes to elevated radiation exposure for personnel.
• Operational characteristics of X-ray systems necessitate a re-evaluation of dosimetric surveillance for airport security staff.