Background Level: 1. The concentration of a substance in an environmental medium (air, water, or soil) that occurs naturally or is not the result of human activities. 2.
background level In toxic substances monitoring, the average presence of a substance in the environment, originally referring to naturally occurring phenomena.
Background level
An average or expected amount of a substance or radioactive material in a specific environment, or typical amounts of substances that occur naturally in an environment.
Background level
In air pollution control, the concentration of air pollutants in a definite area during a fixed period of time prior to the starting up or on the stoppage of a source of emission under control.
Background level - A typical level of a chemical in the environment. Background often refers to naturally occurring or uncontaminated levels. Background levels in one region of the state may be different than those in other areas.
Background Level: The amount of a substance typically found in the air, water, or soil from non-site related activities.
Under the Safe Drinking Water Act (USA), primary MCL is a regulatory concentration for drinking water which takes into account both adverse effects (including sensitive populations) and technological feasibility (including natural background levels): ...
or special nuclear materials regulated by the Nuclear Regulatory Commission. The typically quoted average individual exposure from background radiation is 360 millirems per year. G-M meters usually read 0.03mR/hr or 400cpm for background levels.
 See also: Site, Hazard, Monitor, Water, Concentration
  
|
RSS
