The radioactivity of uranium mineras is usually more in comparison to pure uranium. This is due to presence of … in the mineral.

The radioactivity of uranium mineras is usually more in comparison to pure uranium. This is due to presence of … in the mineral.
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The radioactivity of uranium mineras is usually more in comparison to pure uranium. This is due to ... . actinium B. thorium C. radium D. plutonium
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