absorbed dose · International / US legacy · Modern/historical
1 rad = 0.01 Gy = 1 cGy
Converter
absorbed dose · International · Modern
gray
exact
- Record
- M041
- Definition quality
- Standardized
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 Gy = 1 J/kg
History & use
The 15th CGPM adopted the gray in 1975, citing the need for clearer SI radiation units and the risk of errors in therapeutic work.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high