Iodine 125 emits gamma rays when it decays to Tellerium 125 and has a half life of 60 days. It a 0.0020g pelet of iodine 125 is implanted iinto a prostate gland, how much iodine 125 remains there after one year?

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Q: A precursor of modern-day bison is Bison latifrons. A fossil found in North Dakota was dated with…

A: Given that : The half-life of 14C is 5730 years. The initial concentration of 14C is 100 %. Out of…

Q: 1. A substance has a mass of 5 grams after decaying for 100 minutes. What was the mass of the…

A: Given that: Mass of substance left after decaying = 5 g Total time for decaying of substance = 100…

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…

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Q: 29) a rock from the moon was found to contain 1.0 x 10* g (A,) of uranium-238 and 4.0 x 10“ g…

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

Q: Iodine -125 emits gamma rays when it decays to Tellerium -125 and has a half life of 60 days. If…

A: Given, half life of Iodine -125 t1/2 = 60 days            initial mass of Iodine -125 = 0.020 g The…

Q: if the passing of five half -life leaves 50.0g of a of radioisotope sample, how much was present in…

A: Mass of sample after 5 half life = 50 g Initial amount = ?

Q: The half-life of 238U is 4.5 * 109 yr. A sample of rock of mass 1.6 gproduces 29 dis>s. Assuming…

A: The given data contains, mass = 1.6 g. half life=4.5×109 year.

Q: An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if…

A: We will use first order kinetics formula

Q: What is the original mass of C-14 in a sample if 10.00 mg of it remains after 20,000 years? The…

A: The C-14 decays according to first order kinetics. Since we know that the relationship between the…

Q: A patient is given 0.500 ug of technetium -99m, a radioactive isotope with a half-life of 6 hours.…

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Q: Iodine 1 31 has a half life of about 8 days.  In 40 days what percent of the original sample would…

A: Formula used :-  t1/2 = .693/k  Where k is rate constant. k = 2.303/t log [A0]/[A]

Q: Since the radioactivity of 233UF6 with a mass of 0.420 g is 9.88 * 104 Bq, find the half-life for…

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Q: How many hours until the isotope decays to 1.56 x 10-3 mg?

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Q: It takes 32 days for 512 grams sample of element X to decay to final amount of 4grams. What is the…

A: We are asked to calculate the half-life of element X.

Q: The half-life of the nuclide 211 At is 7.5 h. If 0.100 mg of this nuclide is administered for…

A: The answer to the following question is-

Q: Iodine-131 has a half-life of 8 days. What fraction of the original sample would remain at the end…

A: Half life is the period at which concentration of reactant reduces half of its original value.

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: 1. Co decays with a half-life of 5.27 years to produce 2Ni. (a) Calculate the fraction of a sample…

A: Given a radioactive decay of cobalt to nickle. All radioactive decay follow first order kinetics…

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: We have given the half life of 131I that is t1/2 = 8 days from this we can find the out the decay…

Q: The radioactive isotope 8P decays by positron emission. If the mass of a sample of phosphorus-28…

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Q: A sample of wooden artifact is found to undergo 9.0 6C 1? disintegrations per minute per gram of…

A: Given: The activity of wood sample = 9.0 disintegrations per min. The activity of fresh wood = 15…

Q: The half life of (lodine 131) is eight days. If you had 12 grams of 1311, how long would it take for…

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Q: An archeological sample was predicted to be 9,415 years old. If the C-14 measured at present in the…

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Q: Normal No Spacing Head 三三。 Paragraph Styles 22. A normal adult jawbone contains 200 mg of Carbon-14…

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Q: The radioactive nuclide ??2755 has a half-life of 17.5 hours. What mass of ??2755 remains from a…

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Q: Calcium-45 has a half-life of 162.61 days. If 4 mg of this isotope remains after 300 days, what is…

A: Radioactive decay follows first-order kinetics. The half-life of the first-order reaction does not…

Q: The half-life of 51Cr is 2.78×101 day. Calculate how much time it would take for an isolated…

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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 total mass of radioactive uranium decays with time, different isotopes have different time…

A: First Calculate final value of mass for all three experiment All values are given in question  Then…

Q: If 24% of a certain radiolsotope decays in 6.5 years, what is the half life of this isotope?…

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Q: The half-life of 90Sr is 28.8 years. How long will it take (in years) for a 86.1 mg sample of 20Sr…

A: Given t= 28.8 years. t1/2 = ?

Q: 20. lodine - 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If…

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Q: A fossil gives 435 disintegrations per g of carbon during 1 h of counting. The age of the fossil…

A: Radioactive decay: Radioactive decay or nuclear disintegration is a process in which an atom with…

Q: Potassium-40 decays to argon-40 with a half-life of1.27x109 yr. What is the age of a rock in which…

A: Half-life: It is defined as the time required for a quantity to reduce half of its initial value.…

Q: Tc-99m is the most commonly used radioactive isotope in medicine. It is a gamma emitter and has a…

A: The half life of Tc-99 is six hours. There will be two half lives involved in twelve hours. The…

Q: Thorium-234 decays into half every after 25 days. How much is left of a 438g at the end of 6…

A: Decay of thorium follows first order kinetics. In first-order kinetics, rate of reaction depends on…

Q: How many of the nuclei of a radioactive sample containing 2048 nuclei decay in 3 years, if it's half…

A: Half life of a radioactive sample is the time in which half of the sample is decayed i.e. 50% of the…