what is a half life in biology
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Half-life noun, plural: half-lives. (1) Biological half-life, i.e. the period in which the amount of substance inside the living organism is metabolized and eliminated half of its initial amount by normal biological process.
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- Graphs. It is possible to find out the half-life of a radioactive substance from a graph of the count rate against time. The graph shows the decay curve for a radioactive substance. The decay curve for a radioactive substance. The count rate drops from 80 to 40 counts a minute in two days, so the half-life is two days. In the next two days, it drops from 40 to 20 - it halves.
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- 1 The Definition of Half Life The definition of half-life refers to the amount of time it takes for half of the parent isotope in a sample to decay. 2  Isotopes are variations in the atoms of an element base…. 3  The Periodic Table of Elements Life is sustained by a number of chemical elements.
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Archaeology Half-life. The time taken for half of a given amount of a radioactive substance to decay into a non-radioactive substance; the time taken for half the quantity of a radioactive isotope in a sample to decay and form a stable element.
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Geology The Half Life Time is the amount of time it takes for half of the atoms in a sample to decay. Half Life is a characteristic of each radioactive isotope. Depending on the isotope, its Half Life may range from a few fractions of a second to several billion years. The Half Life of Uranium-235 is 713,000,000 years. The Half Life of Uranium-238 is 4,500,000,000 years. There is even a radioactive isotope of carbon, carbon-14.
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Overview of Your Medication's Half-Life Updated March 07, 2016. A medication's biological or terminal half-life is how long it takes for half of the dose to be eliminated from the bloodstream. In medical terms, the half-life of a drug is the time it takes for the plasma concentration of a drug to reach half of its original concentration. So what does that mean for dosage and medication use? Your diagnosis may be just one component of how your treatment is handled. Your body has a say as well.
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Nuclear Chemistry: Half-Lives and Radioactive Dating The amount of time it takes for one-half of a sample to decay is called the half-life of the isotope, and it’s given the symbol: 1  It’s important to realize that the half-life decay of radioactive isotopes is not linear. 2  Carbon-14 dating can only be used to determine the age of something that was once alive.
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Life Death is the permanent termination of all biological functions which sustain an organism, and as such, is the end of its life. Extinction is the process by which an entire group or taxon, normally a species, dies out. Fossils are the preserved remains or traces of organisms.
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Uranium The time depends on the isotope. The half life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years. The half life is the amount of time during which any given atom of the isotope has a 50% chance of undergoing decay. Seen another way, the half life is the time it takes for half the atoms of an isotope in a mass of that isotope to undergo decay. The time depends on the isotope.
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life instinct definition, life instinct meaning | English dictionary 2. (Biology) the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life) or removed by both elimination and decay (effective half-life)
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- 2. Half-life is the time taken for the count rate to fall to half of its original reading. There are a number of ways to define half-life. Remember one of the above definitions, it may be useful in the exams. An Explanation of Half-life. A radioactive material will have some nuclei that are stable and some that are unstable.
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- This graph is a good illustration of the concept of half-life. If you have a sample of 100 atoms of a radioactive isotope with a half-life of 10 minutes this means that within that first 10 minutes an estimated 50% of the atoms will have gone through radioactive decay and transmuted into another element.
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Half-life 100/(2n) Half-life (abbreviated t1⁄2) is the time required for a quantity to reduce to half its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.
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Drug Half-Life Explained The half-life is the amount of time necessary for the concentration of the drug in the bloodstream of the body to be reduced by one-half. The time it will take for a drug to reach a steady state, or full effectiveness, in the system is based on that half-life.he length of a drug's half-life is significant when the medication is used to treat chronic symptoms, or when a patient's body needs to be clear of the drug in order to take the next step in treatment. For example, some medications are known for having short half-lives, which means the body eliminates them quickly.
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- Radioactive decay is measured in half-lives. Weegy: Radioactive decay is measured in half-lives. User: Fossils are very likely to form from the remains of an animal. Weegy: Fossils are very likely to form from the remains of an animal.
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What is the half life of radioisotope? Half life is the time taken for approximately half of the available nuclei in a sample of radioactive material to decay into something else. It's a characteristic of the isoto…pe, for example, the half life of the isotope of iodine, I131 is 8.08 days.
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It's a Question of Physics: What is meant by half-life? The half-life of a radioactive substance is a characteristic constant. It measures the time it takes for a given amount of the substance to become reduced by half as a consequence of decay, and therefore, the emission of radiation. Archeologists and geologists use half-life to date the age of organic objects in a process known as carbon dating.
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Half-life As an example, the radioactive decay of carbon-14 is exponential with a half-life of 5730 years. A quantity of carbon-14 will decay to half of its original amount (on average) after 5730 years, regardless of how big or small the original quantity was.alf-life (t1⁄2) is the amount of time required for the amount of something to fall to half its initial value. The term is very commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay, but it is also used more generally for discussing any type of exponential decay.
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Biological half-life 1 Polonium in the body has a biological half-life of about 30 to 50 days. 2  Caesium in the body has a biological half-life of about one to four months. 3  Mercury (as methylmercury) in the body has a half-life of about 65 days. 4  Lead in the blood has a half life of 28–36 days.
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Biological half-life In a medical context, half-life may also describe the time it takes for the blood plasma concentration of a substance to halve (plasma half-life) its steady-state.
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- The half life of a radioactive isotope is the time taken for the number of radioactive atoms in the samp…le to decay to one half. Half lives vary hugely, from times like 10-21 seconds, to the very long, approaching the age of our solar system at 4.5x1012 years.
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What is Half-Life? Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil. Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into. Example of How to Use Half-Life. Let's say you have found a fossil you think to be a human skeleton. The best radioactive element to use to date human fossils is Carbon-14.
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half-life Part of the Computing fundamentals glossary: In science, a half-life (also, as a noun, spelled half life) is the amount of time it takes for half of a substance or entity to undergo some specified process.
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- This is called the half-life of the radioactive isotope. There are two definitions of half-life, but they mean essentially the same thing. Different radioactive isotopes have different half-lives. For example, the half-life of carbon-14 is 5,715 years, but the half-life of francium-223 is just 20 minutes.
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Bio 1510 Exam Study The age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactive isotopes. The time required for half of a radioactive isotope to decay is called the half-life of that isotope. For example, the isotope carbon-14 has a half-life of 5,730 years.
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- Bipolar Disorder. A medication's biological or terminal half-life is how long it takes for half of the dose to be eliminated from the bloodstream. In medical terms, the half-life of a drug is the time it takes for the plasma concentration of a drug to reach half of its original concentration.