X-ray dose estimation from cathode ray tube monitors by Monte Carlo calculation

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Computational Physics

Background:

• Cathode Ray Tube (CRT) monitors can emit bremsstrahlung radiation due to electron interactions with the screen.
• Accurate dosimetry for low-dose-rate radiation from CRTs is challenging.
• Understanding operator radiation exposure is crucial for workplace safety.

Purpose of the Study:

• To calculate the dose equivalent (DE) and effective dose (ED) for operators exposed to CRT monitor radiation.
• To evaluate the protective efficacy of leaded glass shielding against CRT emissions.
• To assess ambient dose equivalent (ADE) and personal dose equivalent (PDE) for different body regions.

Main Methods:

• Utilized the Monte Carlo (MC) method with the MCNP code for radiation transport simulation.
• Simulated photon emissions from a CRT monitor and their interaction with a phantom.
• Calculated DE and ED with and without a leaded glass shield.

Main Results:

• The mean photon energy reaching the operator was calculated to be above 17 keV.
• The estimated effective dose (ED) to the phantom was 454 μSv/year (348 nSv/h).
• Leaded glass shielding reduced the phantom ED to 16 μSv/year (12 nSv/h).

Conclusions:

• CRT monitor radiation poses a quantifiable risk, necessitating protective measures.
• Conventional leaded glass significantly attenuates radiation, effectively reducing operator dose.
• The study provides valuable dosimetric data for assessing and mitigating CRT radiation exposure.