Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to incandescence for long periods of time. Natural thorium is almost 100% 232Th , with a half-life of 1.405 × 1010 y. If an average lantern mantle contains 350 mg of thorium, what is its activity in Bq?

Principles of Physics: A Calculus-Based Text
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Chapter30: Nuclear Physics
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Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to incandescence for long periods of time. Natural thorium is almost 100% 232Th , with a half-life of 1.405 × 1010 y. If an average lantern mantle contains 350 mg of thorium, what is its activity in Bq? 

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