| HRA | health record analyst; health risk appraisal; heart rate audiometry; hereditary renal adysplasia; hi... |
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| IMR | individual medical record; infant mortality rate; infant mortality risk; Institute for Medical Resea... |
| IRIS | integrated risk information system; interleukin regulation of immune system; International Research ... |
| MCRI | Multifactorial Cardiac Risk Index |
| MRFIT | Multiple Risk Factor Intervention Trial |
| radiation inactivation | The technique of inactivating proteins in freeze dried (lyophilised) preparations using high energy particles (e.g. Electrons). One high energy particle can apparently inactivate all of the components of a multisubunit polypeptide, the method is therefore used to determine the molecular weight of functional oligomers. (18 Nov 1997) |
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| radiation injuries | Harmful effects of non-experimental exposure to ionizing or non-ionizing radiation in chordates. (12 Dec 1998) |
| radiation injuries, experimental | Harmful effects of exposure to ionizing or non-ionizing radiation produced experimentally in chordates. (12 Dec 1998) |
| radiation, ionizing | Electromagnetic or corpuscular radiation capable of producing ions, directly or indirectly, in its passage through matter. The wavelengths are equal to or smaller than those of short (far) ultraviolet radiation and include gamma and X-rays and high-energy elementary particles. (12 Dec 1998) |
| radiation leukaemia virus | A murine leukaemia virus isolated from radiation-induced lymphomas in c57bl mice. It is leukemogenic, thymotrophic, can be transmitted vertically, and replicates only in vivo. (12 Dec 1998) |
| radiation monitoring | The observation, either continuously or at intervals, of the levels of radiation in a given area, generally for the purpose of assuring that they have not exceeded prescribed amounts or, in case of radiation already present in the area, assuring that the levels have returned to those meeting acceptable safety standards. (12 Dec 1998) |
| radiation myelitis | Damage to the spinal cord from exposure to X-rays or other high energy radiation; usually radiation myelitis. Synonym: radiation myelitis. (05 Mar 2000) |
| radiation myelopathy | Damage to the spinal cord from exposure to X-rays or other high energy radiation; usually radiation myelitis. Synonym: radiation myelitis. (05 Mar 2000) |
| radiation, nonionizing | Electromagnetic radiation which does not produce ions in matter through which it passes. Its wavelengths are generally greater than those of far ultraviolet radiation and range through the longest radio waves. (12 Dec 1998) |
| radiation of corpus callosum | The spreading out of the fibres of the corpus callosum in the centrum semiovale of each cerebral hemisphere. Synonym: radiatio corporis callosi. (05 Mar 2000) |
| radiation oncologist | A physician specifically trained in the use of high energy X-rays to treat cancer. (09 Oct 1997) |
| radiation oncology | <study> The medical study of the use of radiation (X-rays, gamma rays or electrons) to destroy cancers. (09 Oct 1997) |
| radiation physicist | A nonmedically qualified person who specialises in the application of physics to plan and deliver irradiation, assisting the radiotherapist in planning and treatment. (16 Dec 1997) |
| radiation pneumonitis | Injurious effects of radiotherapy on the lungs. There are three phases in the reaction of the lungs to radiation injury: an acute phase occurring 1 to 2 months after exposure, a subacute phase 2 to 9 months after exposure, and a chronic or fibrotic phase more than 9 months after exposure. In the acute phase there is vascular damage, congestion, oedema, and mononuclear cell infiltration; in the subacute phase the alveolar walls are infiltrated with mononuclear inflammatory cells and fibroblasts; in the chronic phase, alveolar fibrosis and capillary sclerosis take place. (cecil textbook of medicine, 19th ed, p2343) (12 Dec 1998) |
| radiation poisoning | A systemic condition caused by substantial whole-body irradiation, seen after nuclear explosions or accidents, rarely after radiotherapy. Manifestations depend on dose, ranging from anorexia, nausea, vomiting, and mild leukopenia, to thrombocytopenia with haemorrhage, severe leukopenia with infection, anaemia, central nervous system damage, and death. Synonym: radiation poisoning. (05 Mar 2000) |