The activation energy of 247Cm is 6.0MeV. If a nucleus of 246 Cm captures a thermal neutron, determine whether fission is likely to be induced.
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- estimate the critical mass of sphere of 92U238. assuming that the fission and radiative capture cross section are equal.the absorption cross section for fission neutrons is 5 barns . the density of the uranium is 18*10^3 kg/m^3A radiation worker stands 10 cm away from a radioactive source of 55 mCi 57Co. Calculate the exposure value received by the worker while standing for 2 hr near the source. The isotope half-life is 271.8 days.If a reactor produces an average power of 1000 MW for a year, a. How much U-235 is used up assuming 200 MeV are released per fission and the efficiency is 33.3%? b. Also, how much mass is turned into energy?
- A 75 kg patient swallows a 33 μCi beta emitter whose half-life is 5.0 days and whose RBE is 1.6. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body. You are a health care worker needing to find the patient's dose equivalent after one week. These series of steps will help you find that dose equivalent. In all questions, assume the radioactive nuclei are distributed throughout the patient's body and are not being excreted. Part A How many radioactive nuclei did the patient swallow? Express your answer using three significant figures. ▸ View Available Hint(s) No= ΜΕ ΑΣΦ Submit ?Calculate the Q value and threshold energy for the 20Ne( α, 12C)12C reaction. What will be the sum of the kinetic energies of the 12C nuclei if the alpha particle initially has 45 MeV of kinetic energy in the lab?The half-life of 1311 is 8.04 days. (a) Convert the half-life to seconds. S (b) Calculate the decay constant for this isotope. S-1 (c) Convert 0.570 μCi to the SI unit the becquerel. Bq (d) Find the number of 13¹1 nuclei necessary to produce a sample with an activity of 0.570 μCi. 1311 nuclei (e) Suppose the activity of a certain 13¹1 sample is 6.90 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.) half-lives mCi
- Why can heavy nuclei with odd numbers of neutrons be induced to fission with thermal neutrons, whereas those with even numbers of neutrons require more energy input to induce fission?A large power reactor that has been in operation for some months is turned off, but residual activity in the core still produces 150 MW of power. If the average energy per decay of the fission products is 0.96 MeV, what is the core activity in units of curies?