| REG | radiation exposure guide; radioencephalogram, radioencephalography |
|---|---|
| REMAB | radiation-equivalent-manikin absorption |
| REMCAL | radiation-equivalent-manikin calibration |
| RERF | Radiation Effects Research Foundation |
| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |