Background: Chest trauma or chest injury is a kind of injury to chest that leads to life threatening impact. Radiation imaging is used for trauma assessment, treatment and monitoring. Objectives: The purpose of this study was to estimate of the radiation dose received in chest x-rays for traumatic patients in the Majmaah area and matched the results nationally and internationally. Furthermore, it aims to determine the reference radiation dose for chest x-rays. Methods: Sample of 160 patients were evaluated at radiology department of King Khaled Hospital- Majmaah, Saudi Arabia. The average patient age for adults was 34.5 ± 12.9 with the range of (18-80) (years) and for pediatric patients was 7.6 ± 2.5 with range of (1-16) years. The average and range of exposure parameters were 72.8 ± 8.3 (81.8-124.9) and 1.5 ± 0.9 (0.3-2.5) for X-ray tube potential (kVp) and current multiplied by the exposure time(s) (mAs), respectively. Results: The measured dose for adult patients were (0.20 ± 0.07 (0.13-0.37) and 0.24 ± 0.1 (0.06-0.74) for female and male respectively. The measured dose for pediatric patients were (0.20 ± 0.07 (0.13-0.37) and 0.18 ± 0.03 (0.06-0.23) for female and male respectively. Conclusion: The study was revealed that 90% of the chest x-rays exposures with normal dose levels. However, precise justification is required, especially for young patients.