Absorbed dose

Grays and rads — energy deposited in matter.

4 units

1 Gray = 100 Rad (exact)

Quick table

Sample conversions from Gray to Rad
GrayRad
0.110
0.550
1100
2200
5500
101000
252500
505000
10010000

How this system works

One gray is one joule per kilogram. The rad is the CGS-era unit: 1 Gy = 100 rad. This is absorbed dose, not equivalent dose (sievert/rem), which weights radiation type.

Base unit: gray. Gray is SI; Rad is Other.

History and fun facts

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