What percentage of reactant will remain after 120 seconds if the half-life is 60 seconds for a first- order reaction?
Q: A clinical technician finds that the activity of a sodium-24 sample is 136 cpm. What will be the…
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Q: The half life of an unknown substance is 1 week. How much of its nuclei were disintegrated after 10…
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Q: decay rate is conpounded continously with what is exponential model for substance started with 50 mg…
A: According to the exponential model for the decay process of a substance: the general growth…
Q: A vial contains 2000 MBq of Technetium-99m on the 18th June 2014 at 06:00. How much will it contain…
A: The time difference between the activity is Considering that the half-life of Technitium-99m is 6h,…
Q: Calculate the activity of a pure 9.5-μgμg sample of 32 over 15P (T1/2=1.23×106s).
A: Mass of sample (m) = 9.5 ×10-6 grams Molecular mass of P-32 = 32 grams Half life (T1/2) = 1.23×106…
Q: If a material has a half life of 92.5 days, how long will it take for 75% of the material to decay?…
A: Half life of the material=92.5days 75% of the material decay
Q: A Geiger- Mueller counter registers an initial reading of 3200 counts while measuring a radioactive…
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Q: Example (3) : 0.2 gram of pure potassium 40 ("K) emit about 10 beta rays per second .Estimate its…
A: Mass , m = 0.2 gm Atomic weight = 40 To find = Half life
Q: hromium-51 is used in imaging red blood cells and has an effective half-life of 27 days. If a dose…
A: Given: The half-life time of the red blood cell is 27 days. The initial activity is 24 μCi. The…
Q: . A saline solution of 24Na with an activity of 300 kBq is injected into the bloodstream of one…
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Q: Question 6 What KE must a neutron have to make fission probable in U-238?
A: The answer for this question has been shown below....
Q: A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage…
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Q: Cs-137 has a half-life of 30.5 years. If the initial amount of sample is 10 g how much will be left…
A: For heavy nuclei, due to increased coulombic repulsion, the number of protons and neutrons may not…
Q: If the half-lifenof cesium-137 is 30 years, approximtely how much time is required to reduce a…
A: Half life of cesium, t1/2=30 years The mass of sample, Ao= 1 kg The reduced mass of sample, A=1 g…
Q: 15. An 85 kg person was exposed to a gamma source and received a whole body dose of 0.5 Sv. How much…
A: The dose equivalent is given by
Q: a substance has a half life of 1000 years, and an initial mass of 100 grams, how much of the…
A: half-life of substance= 1000 Years No= Initial mass= 100 grams
Q: Forced vibratory system, a body of mass 2 kg vibrates in a viscous liquid. The 20 N harmonic…
A: Given that: m=2 kgF=20 NA=15 mm=0.015 mT=0.15 s
Q: The activity of 14C14C in a 70 -kg-kg human body is estimated to be 3.7 kBqkBq . What is this…
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Q: The half life iodine-131 is 10 days. What fraction will be left after 30 days if the original mass…
A: Given that, The half-life iodine-131 is 10 days, T1/2 = 10 days The formula for the half-life is…
Q: If we had a radioactive waste giving off 5 MeV of gamma radiation, how thick would the following…
A: Given: Radiation needs to be reduced by 99%=0.99 To find: The thickness of substances for air,…
Q: 7.50 mCi of 99m Tc is used in a brain scan. What is the mass of technetium?
A: Here, the activity is The equation for the activity is
Q: Sr-90 is a byproduct of nuclear reactions inside nuclear reactor and a has a half-life of 29 years.…
A: Some configurations of protons and neutrons inside a nucleus are unstable. When an atomic nucleus is…
Q: Isotope X has a half-life of 100 days. A sample is known to have contained about 1,500,000 atoms of…
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Q: For a chain reaction the following rate equation is obtained. Find the CB value.
A: The chain reaction initially starts with component A (at t=0) as more and more of it is converted…
Q: A cancerous tumour is exposed to an a-emitter with an RBE of 16. What absorbed dose, in Gy, is…
A: RBE of 16. 64 Sv
Q: The rate of a simple enzyme reaction is given by the standard Michaelis–Menten equation: rate = Vmax…
A: Given: Rate = Vmax SS+km
Q: Technetium-99 m has a half life of 4.8 hours. If a patient receives a dose with an activity of 60.2…
A: Given data : Half life (t1/2) = 4.8 hours Dose received (N0) = 60.2 mCi…
Q: The isotope iodine -131 has a half-life of 8 days. If an individual is injected with 100 mg of…
A: Given that :the half-life of iodine-131, the initial amountthe elapsed time
Q: Consider two nuclei A i+1 X i and A i−1Yi+2, where i is a positive integer number. According to the…
A: This is a question regarding the binding energy of a nucleus according to the semi-empirical mass…
Q: A sample contains 1.0 GBq of ⁹0 Sr and 0.62 GBq of ⁹0Y. (a) What will be the total activity of the…
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Q: Experimentally, it is found that natural potassium emits 31 beta particles per second per gram and…
A: The objective of the question is to determine the half-life period of K-40 using the given data…
Q: Find the absorbed dose if the electrons are completely absorbed in 106 g of tissue. Answer in units…
A: Given: The number of electrons emitted in a 15 day period is 1.168×1012. The total energy…
Q: a) in ten days the radioactivity of cerium-141 is reduced by 19.3%. what is the half time?(-…
A: What is the half life of cerium-141?given,Radioactivity decreases by 19.3%time(t)=10 days=8.64×105 s
Q: A radioactive material decomposes half of its amount per minute. If after 2 mins, 100% undecayed…
A: Half of amount decay in 1 min
Q: A large amount of Sr was released during the Cher- nobyl nuclear reactor accident in 1986. The Sr…
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Q: Some amount of KCl has decay rate 5000 Bq. The decay is due to K40 in the substance. Find the amount…
A: Using the expression for activity, R=0.693Nt1/2N=Rt1/20.693=5000 Bq1.251×109 y0.693…
Q: The C14 with an activity of 10 Ci is in a 1.0 mm thick lead box. Calculate the number of beta…
A: C14 has an activity of 10 Curie1 curie is defined as 3.7×1010 decays/sSo, 10×3.7×1010=37×101037×1010…
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