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The age of the Earth is about 4.543 x 10 9 years. When the Earth formed, a certain radioisotope with a half-life of 1.05 x

The age of the Earth is about 4.543 x 10⁹ years. When the Earth formed, a certain radioisotope with a half-life of 1.05 x 10⁸ years was created.If the radioisotope stated as 250 mg, how much would remain since the Earth's formation? [3 marks]

Tritium, a by-product of the CANDU nuclear power reactor, has a half life of 12.3 years. How much time is required for its radioactivity to reach one-quarter of its original level? [3 marks]

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