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 200 mg of thorium, what is its activity (in bq)?
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= Avagadro's number
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