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Quick answers.

›What is the difference between Gray and Sievert?

Gray (Gy) measures the physical absorbed dose of radiation, while Sievert (Sv) measures the effective biological dose. For gamma and X-rays, 1 Gy is equal to 1 Sv, but for other types of radiation like neutrons or alpha particles, the Sievert value is higher.

›How do I convert rad to Gray?

The conversion is a factor of 100. One Gray is equal to 100 rads, and one rad is equal to 0.01 Grays or 10 milligrays (mGy).

›Are sub-units like millisieverts supported?

Yes. You can enter values in basic units or common prefixes like milli (m) and micro (μ). For context, a standard chest X-ray is roughly 0.1 millisieverts.

›What is a rem?

The rem (Roentgen equivalent man) is an older unit for equivalent dose used primarily in the United States. One Sievert is equal to 100 rem, and one rem is equal to 10 millisieverts.