Question 1

What units measure radioactivity?

Accepted Answer

Becquerel (Bq) = 1 decay/s. Curie (Ci) = 3.7×10¹⁰ decays/s. SI uses becquerel.

Question 2

How do radioactivity units convert?

Accepted Answer

1 Ci = 37 GBq. 1 mCi = 37 MBq. 1 μCi = 37 kBq. Curie is based on 1g radium-226.

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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