Half-life is closely related to the property of Radioactive Decay and represents the time taken for half the Atoms in a Radioactive substances to undergo decay and change into another nuclear form (either a radioactive daughter product or a stable ...
Half-Life
1. The time required for a pollutant to lose one-half of its original concentration. For example, the biochemical half-life of DDT in the environment is 15 years. 2.
half-life: Also called radiological or physical half-life, this is the amount of time it takes for half of the radioactivity in a material to be gone or to decay.
half-life The time required for a pollutant to be reduced by 50 percent of its original amount.
half-tide level A tidal datum. The arithmetic mean of mean high water and mean low water. Same as mean tide level.
Half-life (t½)
The time it takes for half the original amount of a substance to disappear.
Half-life
The amount of time that is required for a radioactive substance to lose one-half its activity. Each radioactive substance has a unique half-life. It is also used to describe: ...
Half-life: The time in which one-half of the activity of a particular radioactive substance is lost due to radioactive decay. Measured half-lives vary from millionths of a second to billions of years.
half-life. The length of time required for the mass, concentration, or activity of a chemical or physical agent to be reduced by one-half.
halogen. One of the chemical elements chlorine, bromine, or iodine.
Half-Life
(physical, biological or effective) -1) The time for a quantity of material/chemical to diminish by a factor of half (because of nuclear decay events, biological elimination of the material, or both).
H half-life (biological)
Definition (english only)
The time required for a living organism to eliminate, by natural processes, half the amount of a substance that has entered it.
plasma half-life
See elimination half-life
plasmapheresis
Removal of blood from the body and centrifuging it to obtain plasma and packed red blood cells: the blood cells are resuspended in a physiologically compatible solution (usually ...
Half-life: The biological half-life of a substance (e.g. antibodies) is the time required for half of that substance to be eliminated from the body.
Half-life: time required for one-half of a specified substance to decompose.
Hammermill: type of crusher or shredder used to break up waste materials into smaller pieces.
Half-life: Radioactively, half-life is the time required for half of a given quantity of material to decay. Chemically, it is the time required for half of a given quantity of material to undergo a chemical reaction.
top
Half-life
The time in which half the atoms of a particular radioactive substance disintegrate to another nuclear form. Measured half lives vary from millionths of a second to billions of years. Also referred to as the physical half-life.
Carbon-14 has a half-life of 5 700 years, meaning that half of it is converted to non-radioactive carbon in 5 700 years and every 5 700 years thereafter half of the remainder is converted.
biological half-life the time it takes for a body to rid itself of one half its load of a substance.
Uranium-Thorium Dating - An absolute dating technique which uses the properties of the radioactive half-life of Uranium-238 and Thorium-230. The half-life of uranium-238 is 4.
It has a half-life of 15 years and can collect in fatty tissues of certain animals.
dry sample.
H
half-life. The length of time required for the mass, concentra-
tion, or activity of a chemical or physical agent to be ...
A term used to refer collectively to the immediate products of the radon decay chain. These include Po-218, Pb-214, Bi-214, and Po-214, which have an average combined half-life of about 30 minutes.
Source: Terms of the Environment
...
Radon Decay Products- A term used to refer collectively to the immediate products of the radon decay chain. These include Po-218, Pb-214, Bi-214, and Po-214, which have an average combined half-life of about 30 minutes.
 See also: Environment, Hazard, Exposure, Air, Waste
  
|
RSS
