Answer: Alpha particles produced from radioactive decays
Chapter 19, Problem 19.102(choose chapter or problem)
Alpha particles produced from radioactive decays eventually pick up electrons from the surroundings to form helium atoms. Calculate the volume (mL) of He collected at STP when 1.00 g of pure 226Ra is stored in a closed container for 100 yr. (Hint: Focusing only on half-lives that are short compared to 100 years and ignoring minor decay schemes in Table 19.3, first show that there are 5 particles generated per 226Ra decay to 206Pb.)
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