| Abbreviation | Unit | 1 Base Unit |
|---|---|---|
| Gy | gray | 1 |
| EGy | exagray | 1E+18 |
| Erd | million million million rad | 10000000000000000 |
| GGy | gigagray | 1000000000 |
| Grd | thousand million rad | 10000000 |
| MGy | megagray | 1000000 |
| Mrd | million rad | 10000 |
| TGy | teragray | 1000000000000 |
| Trd | million million rad | 10000000000 |
| cGy | centigray | 0.01 |
| crd | hundredth of rad | 0.0001 |
| dGy | decigray | 0.1 |
| drd | tenth of rad | 0.001 |
| fGy | femtogray | 1E-15 |
| frd | femtorad | 1E-17 |
| kGy | kilogray | 1000 |
| krd | thousand rad | 10 |
| mGy | milligray | 0.001 |
| mrd | thousandth of rad | 1E-05 |
| nGy | nanogray | 1E-09 |
| nrd | nanorad | 1E-11 |
| pGy | picogray | 1E-12 |
| prd | picorad | 1E-14 |
| rd | rad | 0.01 |
| uGy | microgray | 1E-06 |
| urd | millionth of rad | 1E-08 |