| NCRP | National Council on Radiation Protection [and Measurements] |
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| 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... |
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |
| K-radiation | Usually a very penetrating form of x-radiation excited by cathode rays (high speed electrons) impinging upon a metal anode such as tungsten; the energy of the radiation is a function of the binding energy of the K-shell electrons of the metal anode. (05 Mar 2000) |
|---|---|
| L-radiation | An x-radiation of slight penetrating power excited by cathode rays (high speed electrons) impinging on a metal anode; the energy of the radiation is a function of the binding energy of the L-shell electrons of the metal anode. (05 Mar 2000) |