21. The main ore of thorium is
22. The main ore of uranium is
23. In β-decay of radioactive material, the ratio of neutron to proton
24. Thorium metal
25. A radioactive isotope undergoes decay with respect to time following __________ law.
26. Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
27. The ratio of atomic radius to its nuclear radius is about
28. Thorium can be converted into U-233 in a __________ reactor.
29. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
30. The number of neutrons in the nucleus of Uranium-233 (92U233) is
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