| HEIR | health effects of ionizing radiation; high-energy ionizing radiation |
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| BEIR | biological effects of ionizing radiation |
| FREIR | Federal Research on Biological and Health Effects of Ionizing Radiation |
| 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) |
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| ionizing radiation | Corpuscular (e.g., neutrons, electrons) or electromagnetic (e.g., gamma) radiation of sufficient energy to ionise the irradiated material. (05 Mar 2000) |
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