| NACOR | National Advisory Committee on Radiation |
|---|---|
| NCRP | National Council on Radiation Protection [and Measurements] |
| NCRV | National Committee for Radiation Victims |
| NERO | noninvasive evaluation of radiation output |
| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |
| SSR | solar simulated radiation |
|---|---|
| SR | synchrotron radiation |
| TRT | thoracic radiation therapy |