| half-life |
the time required for half the atoms of a radioactive substance to disintegrate or the length of time it takes for a radioactive substance to lose one-half of its radioactivity. Radioactive isotopes have half-lives ranging from split seconds to thousands of years.
출처: www.southerncompany.com/southernnuclear/glossary.a...
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| half-life |
Used to measure the rate of radioactive decay of disintegration. The time lapse during which a radioactive mass loses one half of its radioactivity.
출처: ie.lbl.gov/education/glossary/Glossary.htm
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| half-life |
The time required for a radioactive substance to lose 50 percent of its activity by decay. The half-life of the radioisotope plutonium-239, for example, is about 24,000 years. Starting with a pound of plutonium-239, in 24,000 years there will be one-half pound of plutonium-239, in another 24,000 years there will be one-fourth pound, and so on. (A pound of material remains, but it gradually becomes a stable element.)
출처: www.fusrapmaywood.com/factsheet/gloss.htm
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| half-time |
During a long term, 6-8 credit hours is considered half-time for undergraduate students. For graduate students, 4-5 hours is considered half time.
출처: essc.unt.edu/finaid/glossary.htm
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| half-life |
the length of time it takes for half of the atoms of a radioactive substance to decay. ex., radium-226 has a half life of 1600 years; if we have 100 atoms of Ra-226 today, 1600 years from today we will have 50 atoms of Ra-226, the other 50 atoms will have decayed to radon-222 (also radioactive)
출처: nuclear.bfn.org/glossary.htm
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| half | equally distant from the extremes |
|---|---|
| half | including only half or a portion |
| half | at a point midway between two extremes |
| half | at half the distance |