| background a. |
in measurements of physical or physiological processes, the ongoing generalized, sometimes artifactual, activity from which the more specific activity in question must be distinguished.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| background d. |
in radiography, the density of a processed film due to factors other than the radiation exposure received through the recorded objects or structures, e.g., inherent (film) density, scatter radiation, or fogging.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| background r. |
radiation arising from radioactive material other than that directly under consideration or study. Background radiation due to cosmic rays and natural radioactivity in the environment is always present; additional background radiation may be due to the presence of other radioactive material in the vicinity, or radioactive components of building materials, etc.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| background radiation |
Filling all space, eg the radiation from the early, hot universe.
출처: www.cpepweb.org/main_universe/glossary.html
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| background radiation |
Cosmic rays and natural radioactivity are always present in the environment. In addition, man-made sources also may contribute to the background radiation level. The average New Yorker receives approximately 360 millirem per year from radon and background radiation.
출처: www.westchestergov.com/discemergplan/glossaryofter...
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