A 30-g sample of 5'Co is positioned in the core of a reactor with an average neutron flux of 1014 neutrons/cm2 sec. The absorption cross section of 5°Co is 36 barns. The half-life of 60Co .is 5.3 years a- What is the activity of the sample ?after 7.0 years b- What is the maximum activity for ?the sample c- When does the sample activity ?reach 80% of its maximum activity

A 30-g sample of 5'Co is positioned in the core of a reactor with an average neutron flux of 1014 neutrons/cm2 sec. The absorption cross section of 5°Co is 36 barns. The half-life of 60Co .is 5.3 years a- What is the activity of the sample ?after 7.0 years b- What is the maximum activity for ?the sample c- When does the sample activity ?reach 80% of its maximum activity

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter31: Radioactivity And Nuclear Physics

Section: Chapter Questions

Problem 45PE: Data from the appendices and the periodic table may be needed for these problems. A 60Co source is...

See similar textbooks

Similar questions

The cure of a nuclear reactor generates a large amount of thermal energy from the decay of fission products, even when the power-producing fission chain reaction is turned off. Would this residual heat be greatest after the reactor has run for a long time or short time? What if the reactor has been shut down for months?
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?
Find the radiation dose in Gy for: (a) A 10-mSv fluoroscopic X-ray series, (b) 50 mSv of skin exposure by an a emitter, (c) 160 mSv of and rays from the 40K in your body.
Data from the appendices and the periodic table may be needed for these problems. A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85107Bq. (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00—mCi activity?
(a) How many 239Pu nuclei must fission to produce a 20.0kT yield, assuming 200 MeV per fission? (b) What is the mass of this much 239Pu?
Tritium is naturally rare, but can be produced by the reaction n+2H3H+. How much energy in MeV is released in this neutron capture?
(a) Calculate the energy released in the neutroninduced fission (similar to the spontaneous fission in Example 32.3) n+238U96Sr+140Xe+3n, given m(96Sr)=95.921750u and m(140Xe)=139.92164. (b) This result is about 6 MeV greater than the result for spontaneous fission. Why? (c) Con?rm that the total number at nucleons and total charge are conserved in this reaction.
(a) Calculate the energy released in the neutroninduced fission reaction n+235U92Kr+142Ba+2n, given m(92Kr)=91.926269 and m(142Ba)=141.916361u. (b) Confirm that the total number at nucleons and total charge are conserved in this reaction.