Naturally occurring 40K is listed as responsible for 40 mrem/y of background radiation. Calculate the mass of 40K in grams that must be inside the 54 kg body of a woman to produce this dose. Each 40K decay emits a 1.32 MeV B, and 59% of the energy is absorbed inside the body. 9
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- The half-life of 27Mg is 9.50 min. initially there were 3.70× 1012 27Mg nuclei present. How many 27Mg nuclei are left 29.0 min later? Please give your answer to 2 significant figures. Calculate the 27Mg activities (in Ci) at t = 0 and t = 29.0 min.The ceramic glaze on a red-orange Fiestaware plate is U2O3 and contains 50.5 grams of 238U, but very little 235U. (a) What is the activity of the plate (in Ci)? Ci (b) Calculate the total energy (in J) that will be released by the 238U decay. J (c) If energy is worth 12.5 cents per kW · h, what is the monetary value (in dollars) of the energy emitted? (These plates went out of production some 30 years ago, but are still available as collectibles.) $gram of caesuim (55 Cs) decays by B-emission with a half life of 30 years. (a) Name the resulting iso- tope. (b) Write the equation of decay. (c) If the initial activity of caesuim is 1.0 millicurie (mCi), what is its activity after 60 years. 137 1
- A 200 MW fission reactor consumes half its fuel in 3.00 y. How much 235U did it contain initially? Assume that all the energy generated arises from the fission of 235U and that this nuclide is consumed only by the fission process.Calculate the radiation dose in rem per year for the lung of a weapon plant employee who inhales and retains 1.0*10^-6 Ci plutonium -239 in an accident. The mass of the affected lung tissue is 2.0kg decays by transmission of 5.23Mev alpha particle. Assume RBE value is 20.Naturally occurring 40K is listed as responsible for 16 mrem/y of background radiation. Calculate the mass of 40K that must be inside the 55-kg body of a woman to produce this dose. Each 40K decay emits a 1.32-MeV β , and 50% of the energy is absorbed inside the body.
- A sample of wood from a Thracian chariot found in an excavation in Bulgaria has a 14C activity of 11.2 disintegrations per minute per gram. Estimate the age of the chariot and the year it was made. (half life for 14C is 5.73×10^3 years, and the activity of 14C in living material is 15.3 disintegrations per minute per gram)It is known that the mass of the alpha particle He is 4.002603u, Estimate the binding energy and binding energy per nucleon obtained directly from the reaction channel: I. 2р + 2n He II. Proton emission (Sp) Neutron emission (S,) 1.008665u dan m, I. = 1.007825u, 1u = 1.67 x 10-27kg.The mass defect of nuclei (108X ) is 1.052 amu. Estimate the total binding energy per nucleon in J/nucleon. (c = 2.998 x 108 m/s)