Aerosol 07
Aerosol 07 : Radiation and Radiological Disasters. (a) Particles of solid or liquid matter that can remain suspended in air from a few minutes to many months depending on the particle size and weight. [CARB, 2000: Glossary of Air Pollution Terms]; (b) This is a very broad term applied to any suspension of solid or liquid particles in a gas. Particle diameters may range from about 0.001 micrometres to about 100 micrometres. Mass concentrations may range from 10_9 to 10 grams per cubic metre of gas. [Duffus, 2000: Univ. Edinburgh Med School On-line Chemical Safety Glossary]; (c) A suspension of liquid or solid particles in air. [IRIS, 1999: Glossary of IRIS Terms]; (d) A suspension of microscopic solid or liquid particles in air. See also: Haze, Particulate Matter. [ODEQ, 1999: Air Quality Glossary]; (e) System in which the dispersion medium is a gas and the dispersed phase (composed of solid particles or liquid droplet) does not settle out under the influence of gravity. [SRA, 1999: Glossary of Risk Analysis Terms]; (f) 1. Small droplets or particles suspended in the atmosphere, typically containing sulfur. They are usually emitted naturally (e.g., in volcanic eruptions) and as the result of anthropogenic (human) activities such as burning fossil fuels. 2. The pressurized gas used to propel substances out of a container. 3. A finely divided material suspended in air or other gaseous environment. [USEPA, 1997a: EPA Terms of Environment]; (g) [aerosols] Particles of matter, solid or liquid, larger than a molecule but small enough to remain suspended in the atmosphere. Natural sources include salt particles from sea spray and clay particles as a result of weathering of rocks, both of which are carried upward by the wind. Aerosols can also originate as a result of human activities and in this case are often considered pollutants. See also: Sulfate Aerosols. [USEPA, 2000: Global Warming Glossary]
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