radioactivity background level

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• Background count — Background count, in radioactivity measurements, is the base level radiation count which is subtracted from the measurement being taken.Various sources may contribute to the background count: cosmic rays, natural radioactivity in the environment… …   Wikipedia

• background — ► NOUN 1) part of a scene or description that forms a setting for the main figures or events. 2) information or circumstances that influence or explain something. 3) a person s education, experience, and social circumstances. 4) a persistent low… …   English terms dictionary

• Background radiation — This article is about ionizing radiation. For microwave background radiation from space, see Cosmic background radiation and cosmic background. Thermal radiation emitted by Earth is not considered in this category because it is not ionizing.… …   Wikipedia

• background — I. noun Usage: often attributive Date: 1672 1. a. the scenery or ground behind something b. the part of a painting representing what lies behind objects in the foreground 2. an inconspicuous position 3. a. the conditions that form the setting… …   New Collegiate Dictionary

• background — noun 1》 part of a scene, picture, or description that forms a setting for the main figures, events, etc. 2》 the circumstances prevailing at a particular time or underlying an event.     ↘a person s education, experience, and social circumstances …   English new terms dictionary

• Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …   Wikipedia

• Chernobyl compared to other radioactivity releases — This article compares the radioactivity release and decay from the Chernobyl disaster with various other events which involved a release of uncontrolled radioactivity. Contents 1 Chernobyl compared to background radiation 2 Chernobyl compared… …   Wikipedia

• Ionizing radiation — consists of highly energetic particles or waves that can detach (ionize) at least one electron from an atom or molecule. Ionizing ability depends on the energy of the impinging individual particles or waves, and not on their number. A large flood …   Wikipedia

• Three Mile Island accident — The Three Mile Island accident of 1979 was the most significant accident in the history of the American commercial nuclear power generating industry. It resulted in the release of a significant amount of radioactivity, an estimated 43,000 curies… …   Wikipedia

• Nuclear entombment — Entombment (also referred to as safe enclosure) of a nuclear reactor is a method of nuclear decommissioning in which radioactive contaminants are encased in a structurally long lived material, such as concrete, that will last for a period of time …   Wikipedia

• aging — ag·ing (āʹjĭng) n. 1. The process of growing old or maturing. 2. An artificial process for imparting the characteristics and properties of age. * * * Gradual change in an organism that leads to increased risk of weakness, disease, and death. It… …   Universalium