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After 5 half-lives, 31.25% of the original iodine remains, meaning 68.75% has decayed. Each half-life reduces the amount of the original substance by half, so after 5 half-lives, the remaining fraction is ( \left(\frac{1}{2}\right)^5 = \frac{1}{32} ). Therefore, the decay percentage is calculated as ( 1 - \frac{1}{32} = \frac{31}{32} ), which is approximately 96.875%.
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How much time is required for a 6.95 sample of to decay to 0.850 if it has a half-life of 27.8 days?
The time required for a 6.95 sample to decay to 0.850 if it has a half-life of 27.8 days is 255 days/ Radioactive decay is based on half-lifes, specifically the reciprocols of powers of 2. The equation for decay is... AN = A0 2(-N/H), where A is activity, N is number of half lives, and H is half life. Calculating for the question at hand... 0.850 = 6.95 2(-N/27.8) 0.122 = 2(-N/27.8) log2(0.122) = -N/27.8 -3.04 = -N/27.8 N = 9.16, or TN = (9.16) (27.8) = 255
How does the half life of a nuclide relateto the stability of the nuclide?
The half-life of a nuclide is an indicator of its stability; shorter half-lives generally correspond to less stable nuclides that decay more rapidly, while longer half-lives indicate greater stability and slower decay processes. Stable nuclides have half-lives that can extend to billions of years, while unstable ones may have half-lives measured in seconds or minutes. Thus, a nuclide's half-life provides insight into its likelihood of undergoing radioactive decay over time.
What happens to Iodine-125 brachytherapy seeds after decay?
After decay, Iodine-125 brachytherapy seeds lose their radioactivity and become stable. They no longer emit radiation and pose a reduced risk to surrounding tissues. The decay products may still remain in the body but at very low levels that are generally not harmful.
If the isotope have short half lives is that mean that the isotope is in a stable condition?
No. Only radioactive elements have half-lives, the half-life is the time that it will take for half of the atoms in a sample of a radioactive isotope to decay into another element or isotope. This is a constant property of the isotope and does not depend on the sample size. Stable isotopes never decay.
How many half-lives have carbon gone through if 37245 years have passed and one half-life for carbon is 5730 years?
6.5 half-lives.
How long would it take for iodine-131 to decay into xenon?
The half life of Iodine-131 is 8.02 days, that means that say if you had 1 gram of 131I after approximately 8 days there would be only 0.5g left. The other half would have become Xenon-131. After 6 half lives (~48 days in your case) you would only have 1.6% of the original amount left.
Why is radioactive decay measured in half lifes?
The half-life forms a type of clock used to calculate time passed.
How many half-lives have passed for 50 percent of the original radioactive material?
One half-life has passed for 50 percent of the original radioactive material to decay.
Zn-65 has a half-life of 244 days what percent will decay in 1 year?
Approximately 36% of Zn-65 will decay in 1 year, as it goes through multiple half-lives. By calculation, after 1 year (365 days), 1.49 half-lives have passed (365 days / 244 days per half-life), resulting in about 36% decay.
How long does it take for this radioactive material to decay through 2 half-lives?
It will take twice the half-life of the radioactive material for it to decay through two half-lives. If the half-life is 1 hour, it will take 2 hours for the material to decay through 2 half-lives.
Iodine 131 has a half life of 8 days. When will 10 lbs of iodine 131 not be radioactive anymore?
Never. As a simple exponential-decay problem, it can get as small as you want if you're willing to wait long enough, but it never reaches zero.
Why is it called half-life of an atom?
The half-life of an atom is how long it takes for half of the atom's mass to radioactively decay. This occurs exponentially; therefore, after 2 of the atom's half-lives have passed, 3/4 of the atom will have decay (half during the first half-life, then half of the remaining mass, or one quarter, during the second).
How many half-lives have passed?
To determine how many half-lives have passed, you would need to divide the total time passed by the half-life of the substance. The result would give you the number of half-lives that have occurred.
How long will it take for a 12.0-g sample of iodine-131 to decay to leave a total of 1.50 g of the isotope The half-life of iodine-131 is 8.07 days?
half life is 8.1 days, so it takes 8.1 days for half the iodine sample to decay. It takes another 8.1 days for half of the remaining sample (ie. 1/4th of the original sample) to decay. So it takes 16.2 days for 3/4th of the sample to decay.
How much time is required for a 6.95 sample of to decay to 0.850 if it has a half-life of 27.8 days?
The time required for a 6.95 sample to decay to 0.850 if it has a half-life of 27.8 days is 255 days/ Radioactive decay is based on half-lifes, specifically the reciprocols of powers of 2. The equation for decay is... AN = A0 2(-N/H), where A is activity, N is number of half lives, and H is half life. Calculating for the question at hand... 0.850 = 6.95 2(-N/27.8) 0.122 = 2(-N/27.8) log2(0.122) = -N/27.8 -3.04 = -N/27.8 N = 9.16, or TN = (9.16) (27.8) = 255
How long it would take for 99.9 percent of Cs to decay if its half-life is 30 years?
It would take approximately 300 years for 99.9% of Cs to decay. This is calculated by dividing the half-life by the natural log of 2, which results in approximately 10 half-lives for 99.9% decay.
How fast did ununseptium decay?
The half lives of ununseptium isotopes are of the order of milliseconds.
