Question 1

What is radioactive decay rate?

Accepted Answer

Activity A = λN, where λ is decay constant and N is number of atoms. Rate decreases over time.

Question 2

How is decay rate measured?

Accepted Answer

In becquerels (decays/second) or curies. Decay constant λ = ln(2)/half-life.

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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