When Cobalt-60 Decays It Has A Half-Life Of 5.27 Years How Long Would It Take For 12.5% Of The Cobalt To Remain?
15.81 years.
1: For cobalt-60, which has a half-life of 5.27 years, 50% remains after 5.27 years (one half-life), 25% remains after 10.54 years (two half-lives), 12.5% remains after 15.81 years (three half-lives), and so on.
How long in years does it take cobalt-60 which has a half-life of 5.26 years for a sample to decay until the point that only 0.8% of the original sample remains?
So it would take 2.32 half lives to decay this much, which is 2.32 x 5.2 which is 12.064 years.
How long is cobalt 60s half-life?
about 5.3 years
The time required for a radioactive substance to lose 50 percent of its radioactivity by decay is known as the half-life. The half-life of cobalt-60 is about 5.3 years. How are people exposed to cobalt-60?
How do you calculate years in half-life?
The time taken for half of the original population of radioactive atoms to decay is called the half-life. This relationship between half-life, the time period, t1/2, and the decay constant λ is given by t12=0.693λ t 1 2 = 0.693 λ . Break down tough concepts through simple visuals.
Does cobalt-60 have a short half-life?
Cobalt-60 is the longest-lived radioactive isotope of cobalt, with a half-life of 5.27 years. It is produced by irradiating the stable isotope cobalt-59 with neutrons in a nuclear reactor.
How do you find the half-life of a first order reaction?
It is important to note that the formula for the half-life of a reaction varies with the order of the reaction.
- For a zero-order reaction, the mathematical expression that can be employed to determine the half-life is: t1/2 = [R]0/2k.
- For a first-order reaction, the half-life is given by: t1/2 = 0.693/k.
What is the half-life of cobalt-60 Round your answer to one decimal?
For example, cobalt-60, an isotope that emits gamma rays used to treat cancer, has a half-life of 5.27 years (Figure 11.3.
How long is cesium half-life?
30 years 70 days
Half Lives
| Isotope | Physical Half-Life | Biological Half-Life |
|---|---|---|
| Cesium (Cs-137) | 30 years | 70 days |
| Cs-134 | 2 years | 70 days |
| Iodine-131 (I-131) | 8.1 days | 138 days |
| Sr-90 | 28 years | 18,000 days |
What molecule has the longest half-life?
The data helped the collaboration make the first definitive measurement of xenon-124’s half-life: 18 billion trillion years. “This is the longest lifetime that we have ever directly measured.”
What is the easiest way to calculate half-life?
How to calculate half life? To find half-life: Find the substance’s decay constant. Divide ln 2 by the decay constant of the substance.
How do you calculate the half-life of uranium 235?
λ = decay constant. t = time. From the above formula we can say that to find half- life we need λ or half-life to find which can be found by quantification that is decay in the time interval. From the experiment half – life of U235is 7.04×108 years.
Is cobalt-60 A radioactive isotope?
Radioactive Co-60 is produced commercially through linear acceleration for use in medicine and industry. Co-60 also is a byproduct of nuclear reactor operations, when metal structures, such as steel rods, are exposed to neutron radiation.
Is cobalt blue radioactive?
Cobalt (chemical symbol Co) is a hard, gray-blue metal that is solid under normal conditions. Cobalt is similar to iron and nickel in its properties and can be magnetized like iron. The most common radioactive isotope.
How many protons neutrons and electrons does cobalt-60 have?
The number of Cobalt 60 protons neutrons electrons are 27,33, and 27 respectively.
How do you find the half-life from a graph in chemistry?
The half-life of a reaction can be determined from a concentration-time graph. Pick a reactant concentration and read from the x axis the time it takes for it to half one, two and three times as shown in the figure below.
What happens to the half-life of a radioactive substance as it decays?
For such an ion, there are no longer any electrons available to capture, and therefore the half-life of the electron capture radioactive decay mode becomes infinite.
For what order reaction does the half-life get longer as the initial concentration increases?
The half-life of a zero-order reaction increases as the initial concentration increases.
Which statement is true about the half-life of a first order reaction?
The third statement is; for a first order reaction, the half life is independent of concentration. And it is a true statement.
What is half-life period calculate the half-life of a first order reaction from their rate constants 200 s 1?
Solution : Half life period `(t_(1//2)) = 0.693/k = 0.693/(200 s^(-1)) = 3.465 xx 10^(-3)s`.
How many years would it take for one mole of this radioactive material to decay so that just one atom remains?
You can thus say that it will take 1.9 million years for one mole of plutonium-239 to decay to one atom.
What is the half-life of cobalt 58?
70.86 days
Other Properties
| Parent isomer | Half-life | Half-life |
|---|---|---|
| Cobalt-56 | 77.27 days | stable |
| Cobalt-57 | 271.79 days | stable |
| Cobalt-58 | 70.86 days | stable |
| Cobalt-60 | 5.27 years | stable |
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