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B
Radon - 222
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C
Radium - 224
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D
Thorium 232
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Solution
The correct option is C Thorium 232
The Earth crust contains a number of radioisotopes which are the principal natural sources of radioactivity: thorium 232, uranium 235 and uranium 238. The glistening black sand on the beaches contains radioactive materials such as thorium and monazite. Kerala has the world's highest level of natural radioactivity in a densely populated area, according to the researchers. The beach sand on the West Coast of India, particularly in Kerala, contains one of the rich deposits of thorium in the world.