The half-life of iodine-131 is 8 days. Since the half-life is 8 days, 24 days corresponds to 3 half-lives.
What is the half-life of iodine-131 if after 32 days?
Figure 10.3. 1: The half-life of iodine-131 is eight days. Half of a given sample of iodine-131 decays after each eight-day time period elapses.
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10.3: Half-Life.
| Nuclide | Half-Life (t1/2) | Decay Mode |
|---|---|---|
| Hydrogen-3 | 12.26 years | β− |
| Iodine-131 | 8.07 days | β− |
| Nitrogen-16 | 7.2 seconds | β− |
| Phosphorus-32 | 14.3 days | β− |
How do you calculate the half-life of iodine-131?
Half-Life of Iodine Isotope Example – YouTube
How much of a 32 gram sample of I-131 remains after 48 days half-life of I-131 is 8 days?
Explanation: 32 days means 4 half lives since one half life is 8 days. That means it will be halved 4 times… so the ratio between the initial amount and the amount after 32 days will be 0.54 . There will be 2.2 grams left.
What percentage of an iodine-131 sample remains after 30 days?
What percentage of an initial sample of 13153I remains after 30.0 days? We want the percentage of the original sample remaining after 30 days, or, in other words, we want the ratio N(30 days)/No. so the percentage remaining is 7.53%.
What is the half-life of iodine-131 Quizizz?
The half life of iodine-131 is 8.040 days.
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How do you calculate 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 .
What does half-life of 8 days mean?
What does it mean that the half life is 8 days. Simply it means that due to the decay half of the material will statistically decay every eight days. if you start with one kilo of iodine 131, eight days later you will have 1/2 kilo, in another 8 days you will have 1/4 kilo and in 8 more days 1/8 kilo, etc.
What is the half-life of this isotope?
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.
How do you calculate half-life elapsed?
The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first-order reaction is a constant that is related to the rate constant for the reaction: t 1/2 = 0.693/k.
What is the half-life of iodine 125?
Iodine-125 is a commonly used radionuclide with a half-life of 60 days, emitting gamma rays with a maximum energy of 0.035 MeV (Million Electron Volts).
How long would it take for the iodine-131 sample to decay to 90% of the sample?
It will take 3.36 days for 1/4 of the sample to undergo radioactive decay.
What fraction of the original sample of iodine-131 is left after four half-lives?
The sample has been halved 4 times. There is 1/16 of the original sample remaining.
How long will it take for a 40.0 gram sample of I 131 half-life 8.040 days to decay to 1 100 its original mass?
How long will it take for a 40.0 gram sample of I-131 (half life = 8.040 days) to decay to 1/100 its original mass? 1/100= 0.01. Suppose that n &,ndash, is number of half lifes, then (1/2)n = 0.01 then n = 6.64. So, the time is 6.64*8.040 = 53.4days.
What is a half-life in chemistry?
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive …
Is 10 mg iodine-131 given to a patient how much left after 24 days?
Example 2: If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days. Since the half-life is 8 days, 24 days corresponds to 3 half-lives. After one half-life 5 mg are left, after two half-lives, 2.5 mg, and after 3 half-lives 1.25 mg remain.
What is a half-life Quizizz?
What is Half-life? The amount of time it takes for some of the nuclei in a sample of the isotope to decay. The amount of time it takes for half the electrons in a sample of the isotope to decay.
How long will it take until only 25 percent of the strontium 90 remains?
After 28.8 more years, strontium-90 has decayed to 25 grams. This is called two half-lives.
How long does it take for iodine-131 to decay?
Iodine-131 has a half-life of 8.06 days and decays by beta-particle emission to a stable 131Xe.
What is the half-life of Cs 137?
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 is the decay rate for iodine-131?
Iodine-131 (131I, I-131) is an important radioisotope of iodine discovered by Glenn Seaborg and John Livingood in 1938 at the University of California, Berkeley. It has a radioactive decay half-life of about eight days.
What is the half-life of palladium 103?
With a half-life of 17 days, palladium 103 administered with brachytherapy allows continuous, tumor-site specific low-energy irradiation to the tumor cell population while sparing normal adjacent tissues from radiotoxicity.
What is the half-life of iodine 129?
Iodine-129 decays by emitting a beta particle with a half-life of about 16 million years, the half-lives of all other iodine radionuclides are less than 60 days.
What is I-131 used for?
Iodine-131 is used to treat some diseases of the thyroid gland. Iodine-131is widely used in imaging the thyroid and in treating thyroid cancer and other abnormal conditions such as hyperthyroidism. It also used to diagnose abnormal liver function, renal (kidney) blood flow and urinary tract obstruction.
How long do you have to wait before 99.99% of a sample of iodine-131 has decayed?
In this question, the half-life of iodine-131 is 8 days, which means that after 8 days, half of the sample would have decayed and half would be left undecayed.
What is the half-life of a radioactive isotope of a 500.0 g sample decays to 62.5 g’in 24.3 hours?
Therefore, it takes three half-lives to decay to 62.50g. Therefore, the elapsed time must be triple the length of one half-life. 24.33=8.10 , so it is 8.10 hours.
What happens to the half-life of a radioactive substance as it decays?
Yes, the decay half-life of a radioactive material can be changed. Radioactive decay happens when an unstable atomic nucleus spontaneously changes to a lower-energy state and spits out a bit of radiation. This process changes the atom to a different element or a different isotope.
What fraction remains after 6 half-lives?
Half-life
| Number of half-lives elapsed | Fraction remaining | Percentage remaining |
|---|---|---|
| 5 | 1⁄32 | .125 |
| 6 | 1⁄64 | .5625 |
| 7 | 1⁄128 | .78125 |
| … | … | … |
How old is an artifact if four half-lives have occurred and the half live of carbon-14 is 5730 years?
How old is an artifact if four half-lives have occurred and the half-live of carbon-14 is 5730 years? 7.25 11.4 .
How many half-lives does it take for 6.02 10?
6. How many half-lives would it take for 6.02 x 1023 nuclei to decay to 6.25% (0.376 x 1023) of the original number of nuclei? – 6.02 3.01 – 15.05 = 75 37625/4 hoff 2 .
How do you answer a half-life question?
How to Solve Half-Life Problems : Fun With Math – YouTube
Why do we measure half-life?
Half-life is used because it is impossible to predict when a single atom will decay, only the probability it will decay. This leads to the characteristic that out of a large number of atoms it is possible to predict how many will decay in a given period of time but not which ones.
How do you calculate half-life in pharmacology?
The half-life (t1/2) is the time it takes for the plasma concentration of a drug or the amount of drug in the body to be reduced by 50%. The half-life of a drug can be determined using the following equation: t1/2 = (0.7 x Vd) / Cl, where Vd is volume of distribution and Cl is clearance.