The nuclides among the following, capable of undergoing fission by thermal neutrons, are(A) $^{233}\mathrm{U}$ \quad (B) $^{235}\mathrm{U}$ \quad (C) $^{239}\mathrm{Pu}$ \quad (D) $^{232}\mathrm{Th}$
(a)A, B and D
(b)A, C and D
(c)B, C and D
(d)A, B and C
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
²³³U, ²³⁵U and ²³⁹Pu are fissile with thermal neutrons; ²³²Th is fertile (needs neutron capture to ²³³U) and fissions only with fast neutrons.