Californium 252 is a radioactive isotope that is extremely expensive to produce, often cited as one of the most costly substances in the world. It is produced in nuclear reactors and has specific uses such as in neutron sources for analysis and medical treatments. While technically a radioactive isotope of an element (Californium), it is often discussed in the context of costly "materials".
The costliest metal of the world discovered recently, is
Asked in UPPCS Prelims 2016 · Topic: Metals, Minerals, Ores: Properties, Uses (Uses of common metals and their compounds in industries and daily life)
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