How much radiation is in a chest X-ray?
Last updated September 3, 2026.
About 0.02 mSv - the lowest rung of medical imaging, per the FDA's dose comparison table. The same table lists a CT head at 2 mSv and a CT abdomen at 8, so a chest x-ray delivers a few hundredths of a CT's dose. A single chest x-ray, or a handful over years, is not a meaningful cancer risk; the exposure conversation belongs to repeated high-dose imaging.
What to do
- Do not decline a needed chest x-ray. The dose is trivial against the diagnostic value.
- Mention pregnancy. Any x-ray during pregnancy gets a shielding-or-reconsider conversation.
- Keep your imaging record. Bringing prior images prevents pointless repeats.
- Save the worry for the big doses. Repeated CT scanning is where cumulative exposure genuinely adds up.
Related questions
- Do CT scans cause cancer?
- Is an MRI safe?
- What happens at a mammogram?
- What happens at a bone density scan?