| radio frequency |
1. (Abbreviated RF.) The number of oscillations per second of the electric and magnetic fields in the radio portion of the electromagnetic spectrum, generally that portion between 10 4 and 10 12 Hz; specifically, the frequency of a given radio carrier wave. 2. In radio or radar, pertaining to a signal at the transmitted or received frequency, as opposed to a signal translated to a different frequency (IF signal) or detected (video signal).
출처: amsglossary.allenpress.com/glossary/browse
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| radiometry |
The technique of measuring radiant energy, especially radiant energy in that portion of the total electromagnetic spectrum lying adjacent to the visible region. Radiometry is to be distinguished from the closely related subject of photometry, the latter being specifically concerned with the quantitative response to visible radiation of the human eye. See actinometer.
출처: amsglossary.allenpress.com/glossary/browse
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| radioactive isotope |
An unstable isotope that emits ionizing radiation.
출처: www.fao.org/docrep/003/X3910E/X3910E21.htm
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| radiography |
the formation of images of the inside of the body using radiation projected through the body and onto film; a radiograph is also called an X-ray
출처: www.american-depot.com/services/resources_gl_r.asp
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| radioactive iodine uptake |
A special test used to diagnose thyroid disease. During this procedure, the amount of iodine "taken up" by the thyroid is measured and images or "pictures" of the thyroid gland are taken. So-called hot spots, or areas of particularly strong energy, represent areas of increased hormone production. Cold spots, or particularly weak energy spots, represent poorly functioning or nonfunctioning areas of the thyroid gland.
출처: www.ehealthmd.com/library/hyperthyroidism/HYE_glos...
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