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What is the meaning of half life?
The term half-life refers to the period in which the radioactivity or number of atoms of a radioactive substance decreases by half. The term can be applied to any substance whose quantity decreases exponentially with time.
How do you define half-life in pharmacology?
The term half-life refers to the period in which the radioactivity or number of atoms of a radioactive substance decreases by half. The term can be applied to any substance whose quantity decreases exponentially with time.
How do you get half-life from a graph?
You can get half-life from a graph by picking two points where the (radio)activity decays to one half its value. The interval of time of those two points is the half-life. You can confirm by picking more points, again with a half (radio)activity value and see that the time is the same in each case.
What is the relationship between half life and radio activity?
Half life is quite simply the time required for a radioactive element to decrease by decay to half the amount.
What percentage of a radioactive species would be found as daughter material after seven half lives?
The equation for half-life is AT = A0 2 (-T / H) where A0 is the starting activity, AT is the activity at some time T, and H is half-life in units of T. As a result, seven half-lives would be 2(-7) or 0.0078125 of the original activity.
How do you calculate half lives?
The equation for half-life is ...AT = A0 2 (-T/H)... where A0 is the starting activity, AT is the activity at some time T, and H is the half-life in units of T.There are other versions, but they all work out the same way. Using this version, with 2 as the base instead of e, makes it easier to remember.
What is the half life of an isotope that decays to 50 percent of its original activity on 40.9 hours?
15 days
What is meaning of the term half life?
That is the time it takes for one-half of certain types of atoms to disintegrate. For example, if you have a kilogram of C-14 atoms, after about 5000 years you will only have half a kilogram left - hence, its half-life is about 5000 years.
What does it mean when a doctor talks about the half life of a dosage of a medication?
The half-life of the drug is the time taken for the plasma concentration of the drug to reduce to 50% of its original value. Units of half life are hour, minute, or day. The formula for calculation half life of a drug is as follows: Cp is the concentration at time one and Cp/2 is the concentration at time one half-life later:- In( Cp/2) = In Cp - Kel . t1/2 half life of the drug (t 1/2) = 0.693/kel
The half-life of an isotope is the time required for half the nuclei in a sample to?
Half-life is the length of time required for half the atoms in a radioactive sample to decay to some other type of atom. It is a logarithmic process, i.e. in one half-life, there is half the sample left, in two half-lives there is one quarter the sample left, in three half-lives there is one eight left, etc. The equation is... AT = A0 2 (-T/H) ... where A is activity, T is time, and H is half-life.
The time it takes for half of the radioactive element to decay is the element's what?
The time it takes for half the atoms in a sample of a radioactive element to decay is called the half life.
The half-life of a certain radioactive material is 75 days An initial amount of the material has a mass of 381 kg Write an exponential function that models the decay of this material Find how much?
The generalized exponential half-life equation is ... AT = A0 2(-T/H) ... where A0 is the initial activity, AT is the final activity at time T, and H is the half-life in units of time T. Example using the specific question, for an elapsed time of 50 days, is ... A50 = (381) 2(-50/75) = 240
