Mantles for gas lanterns contain thorium, because it forms an oxide that can survive
Chapter 31, Problem 48(choose chapter or problem)
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% 232 Th , with a half-life of 1.4051010 y . If an average lantern mantle contains 300 mg of thorium, what is its activity?
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