A patient undergoing thyroid radiotracing was initially administered with 50.0 mg of iodine-131. After 3 days, around 38.5 mg of the substances remains in the thyroid of the patient. What is the half-life of I-131 and how many days will it take for the level of substance to drop to 5.00 mg?

Q: The half-life of nucleus Rn-222 is 3.88 days. How many mg of a 5000 mg sample of Rn-222 remains…

A: The half life of a given reaction refers to the time required by a given compound to reduce to half…

Q: It takes 4 h 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of…

A: Half life of first order kinetic reaction is given by:

Q: Iodine-131 has a half life of 8.0 days determine how many days must elapse for a 0.80 mg sample of…

A:

Q: A sample of wood from an Egyptian mummy case has a specific activity of 9.41 d/min-g. How old is the…

A: Solution: We know that --- for a sample of wood from an Egyptian mummy which is related to…

Q: Iodine-131 has a half-life of 8.0 days. How long will it take 10 µg of 131I to decrease to 1/100 of…

A:

Q: If the amount of radioactive phosphorus-32 in a sample decreases from 2.4 mg to 0.30 mg in 42.9…

A:

Q: Determine the half-life of a radionuclide if after 18 days the fraction of undecayed nuclides…

A: Half-life (t1/2) represents the amount of time at which the concentration of the radioactive nuclide…

Q: A 56 mgmg sample of a radioactive nuclide is administered to a patient to obtain an image of her…

A:

Q: In a treatment that decreases pain and reduces inflammation of the lining of the knee joint, a…

A: Initial count (No) = 1100 per second Final count (Nt) = 1.14 per second Time (t) = 24 hours

Q: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

Q: a wooden object from the site of an ancient temple has a carbon-14 activity of 10 counts/min…

A:

Q: A sample of gas from a basement containing radon-222 has an activity of 7 pCi/L, which is above the…

A:

Q: Samples recovered from an archaeological site are determined to have a 14C activity of 1.3 dpm/g.…

A: Given:   The activity of C-14 from recovered sample is 1.3 dpm/g. The activity of C-14 in living…

Q: Calculate the half-life of a radioisotope if it takes 72 years for a sample to decay to 12.5% of its…

A: 100 % to 50 % one t1/2. 50 % to 25 %  second t1/2. 25% to 12.5 third t1/2. three t1/2 = 72 years.…

Q: A mixed thorium decay product sample is separated into elements, yielding a 1.19mg sample of…

A: Actinium-225 is a radioactive substance with a half-life, t1/2 of 9.20 days. t1/2 = 9.20 days * 24…

Q: -33. The number of radioactive nuclides in a sample decays from 1.00 × 1020 to 2.50 × 10º in 10.0…

A:

Q: A sample of copper-64 gives a reading of 83 counts per second on a radiation counter. After 9.1 h,…

A: Answer : We can use first order kinetics to calculate half life of the reaction . Initial count and…

Q: A nuclear technician was accidentally exposed to potassium-42 while doing brain scans for possible…

A: Given, Half life of potassium -42 = 12 hr activity of potassium -42 after 36 hr of exposure = 4.0 μC

Q: 3. The half-life of radon is 3.82 days. What fraction of a freshly separated sample of this nuclide…

A: The half-life of a radioactive isotope (t1/2 ): All radioactive decay first-order reaction kinetics.…

Q: Iodine-131, in a sodium iodide tablet, is used to measure the activity of the thyroid gland. If a…

A: Nuclear chemistry is a branch of chemistry which involved the study of reactions in the nucleus. The…

Q: The half-life of Po-218 is 3.05 minutes. How many minutes does it take for a sample of Po-218 to…

A: Given: Half-life of Po-218 = 3.05 minutes. And the final amount of Po-218 isotope remaining = 2.35 %…

Q: Approximately how many half-lives must pass for the amount of radioactivity in a substance to…

A: Given, radioactivity of the substance decreases below 1% of its initial level.The initial percentage…

Q: 1. What is the half-life of a radioactive isotope if a 500.0g sample decays to 62.5g in 24.3 hours

A:

Q: At 8:00 a.m., a patient receives a 1.5-mg dose of I-131 to treatthyroid cancer. If the nuclide has a…

A: At 8:00 a.m., a patient receives a 58-mg dose of I-131 to obtain an image of her thyroid. If the…

Q: Fluorine-18, which has a half-life of 110 min, is used in PET scans.  If 100. mg of fluorine-18 is…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.

Q: phosphorus-32 is a radioactive isotope with half-life of 14days. a biochemist has a vial containing…

A: The radioactive isotopes follows the first order reactions, which is dependent upon the…

Q: Iron-59 is a radioisotope that is used to evaluate bone marrow function. What is the half-life of…

A: Given, t = 190 days t1/2 = ?

Q: Calculate the half-life of a radioisotope if it takes 144 years for a sample to decay to 12.5% of…

A: N = 0.125 No N/No = 0.125

Q: If a radioisotope's half-life is 2 minutes, after two half-lives there is left   0% of the original…

A: Given, a radioisotope's half-life is 2 minutes.we are asked to calculate the amount of original…

Q: A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (CPM)…

A: Given: Half-life = 5730 years [A]=10 cpm [A]0 = 40 cpm

Q: The carbon−14 decay rate of a sample obtained from a young tree is 0.250 disintegration per second…

A:

Q: A 85.0-mg supply of iodine-131, used in hospitals in the treatment of hyperthyroidism, was stored…

A:

Q: Cobalt-60 is radioactive and has a half life of 5.26 years. How long would it take a sample to decay…

A: Given- Half life=5.26 years  Initial amount=1.90mg Final amount=1.50mg

Q: The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360…

A: As per guidelines if multiple questions posted , first question is allowed to answer , please post…

Q: A patient ingests 155 mg of I-131, a beta emitter with a half-life of 8.0 days. Assuming that none…

A: Half life, t ½ = 8 days= 691200 sDecay constant, k = 0.693/ t ½ = 0.693 /691200 s = 1 x 10-6 s-1.

Q: How many days would it take for a 1.0 milligram sample to reach this level if the half-life…

A: Since the decay reactions are first order  hence we can say 2 things about them  1) half life =…

Q: (c ) Iodine-131 has a half-life of 8 days. How many grams of I-131 in a 4.0 g sample remain after…

A: (c) The amount of the isotope that remains after given decay time is calculates by using below…

Q: The half life of a specific radionuclide is 8 days. How much of an 80mg sample will be left after 24…

A: There are two methods to solve it : Method (1): The half life is the time in which any compound is…

Q: To find the age of a wooden box using C-14 carbon dating, the following information are collected:…

A:

Q: If pure polonium-210 (k = 5.02 x 10-3 day-1) were used in a crime, based on radioactive…

A:

Q: The half-life of radium-226 is 1.8x103 years. How many hours will it take for a 2.50-gram sample to…

A: Interpretation-  To determine how many hours will it take for a 2.50-gram sample to decay to the…

Q: The radioactive isotope 212Pb has a half-life of 10.64 h. A sample containing this isotope has an…

A:

Q: Calculate how long will it take for a sample of a radionuclide with a half-life of 39.9 days decay…

A:

Q: In 2002, a wooden beam from the Wupatki Indian ruin in Arizona was found to contain 227 mg of…

A: Since the carbon decay reactions are first order reactions And since we know that the relationship…

Q: A 10.00-g plant fossil from an archaeological site is found to have a 14C activity of 3094…

A:

Q: 32. The half-life of lodine-123 is 13 hours. If 10 mg of lodine-123 are administered to a patient,…

A:

Q: A patient is given 0.050 mg of Tc-99. How long until the isotope decays to 6.3 x 103 mg? (Half life…

A: Given  Mass of Tc-99  [ A0 ] = 0.050 mg  Remaining Tc -99 [ At ] = 6.3 × 10-3 mg  Half life ( t1/2 )…

Q: time for amount of initial radioactivity radionuclide to decrease to 1/16 of initial amount

A:

Q: At 8:00 a.m., a patient receives a 58-mg dose of I-131 to obtain an image of her thyroid. If the…

A: At 8:00 a.m., a patient receives a 58-mg dose of I-131 to obtain an image of her thyroid. If the…

Q: The half-life of a particular radioactive isotope X is 10.0 days. (1) Determine its decay constant.…

A: half life = 10.0 days.