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The mineral monazite is a rich source of...

The mineral monazite is a rich source of thorium, available in large quantity in kerala. A typical monazite sample contains 9% `ThO_(2)` and 0.35% `U_(3)O_(8)`. `.^(208)Pb` and `.^(206)Pb` are the stable end products in the radioactive decay series of `.^(232)Th` and `.^(238)U` respectively. All the lead in monazite is of radiogenic origin.
The isotopic ratio of `.^(208)Pb//^(232) Th`. was found to be 0.104. The half lives of Th and U are `1.41 xx 10^(10)` years adn `4.47 xx 10^(9)` years respectively.
Estimated isotopic ratio of `.^(206)Pb//^(238) U` in the monazite sample will be:

A

0.166

B

0.266

C

0.366

D

0.466

Text Solution

Verified by Experts

The correct Answer is:
c
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Monazite sample contains 9% ThO""_(2) and 0.35% U""_(3)O""_(8).Pb""^(208) and Pb""^(206) are the stable and products in the radioactive decay series of Th""^(232) and U""^(238) respectively. All the lead in mozaite is of radiogenic origin. The isotopic ratio of Pb""^(208)/Th""^(232) was found to be 0.104. The half lives of Th and U are 1.41xx10""^(16) years and 4.47xx10""^(9) years respectively. Estimated isotopic ratio of Pb""^(206)//U""^(238) in the monazite sample will be

Monazite sample contains 9% ThO""_(2) and 0.35% U""_(3)O""_(8).Pb""^(208) and Pb""^(206) are the stable and products in the radioactive decay series of Th""^(232) and U""^(238) respectively. All the lead in mozaite is of radiogenic origin. The isotopic ratio of Pb""^(208)/Th""^(232) was found to be 0.104. The half lives of Th and U are 1.41xx10""^(16) years and 4.47xx10""^(9) years respectively. Select the information incorrect about Th""^(232)

Monazite is a source of

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In a smaple of rock, the ration .^(206)Pb to .^(238)U nulei is found to be 0.5. The age of the rock is (given half-life of U^(238) is 4.5 xx 10^(9) years).