Nuclear Power Engineering
A fertile material is the one, which can be

Fissioned by fast neutrons
Fissioned by slow (thermal) neutrons
Fissioned by either slow or fast neutrons
Converted into fissile material on absorption of neutron

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Nuclear Power Engineering
Plutonium

Both A & B
Has much lower melting point (640°C ) compared to thorium (1690°C)
Is recovered from spent fuel from thermal nuclear reactor
Neither A nor B

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