Why have salt dome cavities been considered for radioactive waste disposal?

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salt dome Figure 1: Interrelationships of salt structures (see text)

Salt dome cavities have been considered as potential sites for the disposal of radioactive waste primarily due to their high degree of impermeability.1

In the context of geological storage, these formations offer a stable environment that can help isolate hazardous materials from the surrounding environment. Furthermore, salt formations possess higher thermal conductivity than many other types of rock, which allows them to dissipate the heat generated by radioactive decay more effectively. This thermal property is advantageous, as it helps mitigate the risk of structural degradation or cracking that could otherwise compromise the containment of radioactive waste.2