A point Source emitting 5 of neutrons, is placed at the center of sphere of moderator radius R. show that! Ø = = S что sinh CRtd-r} sin h (Rtd)
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- What is the best way for the power plant manager to modify the reactor to meet the demand for electricity? During a heat wave, there is an increased demand for electricity to operate air conditioners. The basic design of a nuclear reactor that generates electricity is shown O lower the control rods, which will absorb more below. neutrons before they can split atoms O raise the control rods so that fewer neutrons are Control rods absorbed and more can split uranium atoms O remove some of the fuel rods, which will leave more room for additional neutrons to split atoms O add additional fuel rods to generate additional CONO neutrons to split uranium atoms Fuel rods Nuclear reactor Submit Save and Exit Next Mark this and return Sign oWhat is the initial intensity, I, of the 5 g 6⁰Co source at a distance of 1m if the gamma rays emitted by 6ºCo have an average energy of 1.9 x 10-1³ J?5. The capture cross section of 5°Co for thermal neutrons is 37 b. (а) 5°CO (p = 8.9 x 10° kg.m³ ) ? What percentage of a beam of thermal neutrons will penetrate a 1 mm sheet of (b) What is the mean free path of thermal neutrons in 'Co ?
- 12 O Consider the fission of 238U by fast neutrons. In one fission event, no neutrons are emitted and the final stable end products, after the beta decay of the primary fission fragments, are 14Ce and "Ru. (a) What is the total of the beta-decay events in the two beta-decay chains? (b) Calculate Q for this fission process. The relevant atomic and particle masses are 238U 238.050 79 u 140Ce 139.905 43 u "Ru 98.905 94 u 1.008 66 uCow's milk produced near nuclear reactors can be tested for as little as 1.00 pCi of I per liter, to check for possible reactor leakage. What mass of I has this activity? (answer in ×10 g)239 239Pu can be bombarded by a neutron and undergo nuclear fission to make an atom of 204 Au and an atom of 3lp. Write the balanced nuclear equation for the process. Make sure to show how many neutrons are given off by this reaction. Include the FULL isotope notation for ALL species involved.
- 33. The core of a thermal reactor consists of a sphere, 50cm in radius, that contains a homogeneous mixture of 25°U and ordinary H,O. This core is surrounded by infinite thick H2O reflector. (a) What is the reflector savings ? (b) What is the critical mass? (c) If the maximum thermal flux is 1 x 1013 neutrons/cm2-sec, at what power is the reactor operating? [ Hint: compute the M2 for core assuming the reactor is bare and of radius 50 cm. Use this value of M to estimate & and then compute new M assuming reactor is bare and of radius 50 + 6. Interate until convergence is obtained.]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?