Question 1

What is the difference between gray and rad?

Accepted Answer

1 Gy = 100 rad. Gray is SI, rad is older CGS unit. Both measure absorbed dose.

Question 2

What does gray measure?

Accepted Answer

Absorbed radiation dose: energy deposited per mass (J/kg). 1 Gy = 1 J/kg.

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.

Gy to rad Converter

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