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|Typical Effective Dose (mSv)||Number of chest X-rays (PA film) for Equivalent Effective Dose||Time Period for Equivalent Effective Dose from Natural Background Radiation|
|Airline flight||0.02||1||2.4 days|
|Chest x-ray (PA film)||0.02||1||2.4 days|
|Skull x-ray||0.1||5||12 days|
|Lumbar spine||1.5||75||182 days|
|Upper GI||6||300||2 years|
|Barium enema||8||400||2.7 years|
|Head CT||2||100||243 days|
|Chest CT||5||250||1.7 years|
|Abdo CT||8||400||2.7 years|
- Average effective dose in millisieverts (mSv) as compiled by Fred A. Mettler, Jr., et al., “Effective Doses in Radiology and Diagnostic Nuclear Medicine: A Catalog,” Radiology Vol. 248, No. 1, pp. 254-263, July 2008.
- Based on the assumption of an average “effective dose” from chest x ray (PA film) of 0.02 mSv.
- Based on the assumption of an average “effective dose” from natural background radiation of 3 mSv per year.