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- Most of the heavy nuclei will undergo decay to become stable by reducing the number of neutrons or protons. The rate at which unstable radioactive nuclei decay in a sample of material is called the activity of the sample.
- The decay probability per nucleus per second is called the decay constant it is given by,
Here t1/2 is known as the half-life of the nucleus. It is the time that it takes for the activity to be reduced by half.
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- A particular rock is thought to be 234 million years old. If it contains 4.84 mg of 238U, how much 206 Pb should it contain? Assume 238U decays directly to 206PB with a half-life of 4.47 × 109 y.(a) What is meant by assuming that the decay constant λ is a constant, independent of time? Under what circumstances might λ change with time? (b) If a nucleus has a half-life of one year, does that mean it will be completely decayed after two years? Explain.The half life of 60Co is 5.7 years. Find the activity of 3.54 milligram of 60Co. Give your answer in decays/second (Bq) Round your answer to 3 significant figures. Add your answer
- Cobalt has one stable isotope, 59Co. What are the likely decay modes and daughter nuclei for (a) 56Co and (b) 62Co?Given that 137 Cz decays to 137 Ba with a gamma - V emission of 0.662 MeV in 85% of the decays, what percentage of decays proceed without gamma emission based on the decay scheme A) 0% B) 6.5% C) 15% D) 93.5%A sample of hypothetical element X decays by positron emission and has a half-life of 79 years. How many years are necessary for a sample of this radioisotope to be reduced by 79%? Answer to the nearest year.
- 1. What is the binding energy per nucleon for ?? 1327 (Aluminum – 27)? Note: A neutral ?? 1327(Aluminum – 27) atom has a mass of 26.981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.0086655 u; and a proton has a mass of 1.007277 u. Also, 1 u = 931.494 MeV/c2.a. 8.3 MeVb. 6.7 MeVc. 5.4 MeVd. 3.4 MeVe. 2.8 MeVplease solve question 3a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? λ = b) How long will it take for the activity of a sample of 17F to decrease to 80% of its initial value? t80% =
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