| ALARA | as low as reasonably achievable [radiation exposure] |
|---|---|
| REG | radiation exposure guide; radioencephalogram, radioencephalography |
| HEIR | health effects of ionizing radiation; high-energy ionizing radiation |
| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |