Q.Radioactive wastes can be disposed off by ________.

High-level radioactive waste is disposed of by burying it deep underground in a stable geological repository, isolating it from the biosphere for the very long periods it remains hazardous.

Radioactive waste (from nuclear power plants, medical isotopes, research reactors) continues emitting harmful radiation for centuries to millennia, so it cannot be treated like biodegradable or combustible waste. Composting (a) only works for organic biodegradable material and does nothing to radioactive isotopes. Burning (b) is equally useless -- radioactivity is a property of the atomic nucleus and is not destroyed by combustion; burning would also disperse radioactive particles into the air. Surface impoundments (c) are shallow ponds/lagoons used for liquid industrial waste and offer no shielding or long-term isolation, making them dangerous for radioactive material. The i …