Question 1

How much radiation is in a CT scan?

Accepted Answer

Head: 2 mSv, Chest: 7 mSv, Abdomen: 10 mSv, Full body: 10-20 mSv. Compare: annual background ~3 mSv.

Question 2

Is CT scan radiation dangerous?

Accepted Answer

Single CT is low risk. Cumulative exposure from multiple scans may matter. Benefits usually outweigh risks.

Question 3

What's the difference between exposure and dose?

Accepted Answer

Exposure (roentgen) measures radiation in air. Absorbed dose (gray/rad) measures energy deposited. Equivalent dose (sievert/rem) accounts for biological effect.

Question 4

What are safe radiation levels?

Accepted Answer

Background radiation: ~3 mSv/year. Occupational limit: 50 mSv/year. Single dose effects start around 250 mSv. Always follow ALARA principle.

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