| ICRU | International Commission on Radiation Units and Measurements |
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| IRP | immunoreactive plasma; immunoreactive proinsulin; incus replacement prosthesis; insulin-releasing po... |
| IRTIS | Integrated Radiation Therapy Information System |
| LASER | light amplification by stimulated emission of radiation |
| LRT | local radiation therapy; long terminal repeat; lower respiratory tract |
| 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) |
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