Thank you for visiting If a sample of radon is taken from a room that is known to be at 87 pCi L and is kept in a well. This page is designed to guide you through key points and clear explanations related to the topic at hand. We aim to make your learning experience smooth, insightful, and informative. Dive in and discover the answers you're looking for!
Answer :
Final answer:
Using the concept of half-life for Radon-222, the activity of radon in the container after two half-lives (just over 8 days) would be approximately a quarter of its original value. The approximate value would be slightly less than 21.8 pCi/L.
Explanation:
We will need to utilize the concept of half-life in the context of radioactive decay. In this case, Radon-222 has a half-life of 3.82 days, meaning that after every 3.82 days, approximately half of the radon atoms in a sample will have decayed into other elements. After one half-life (3.82 days), the activity in the container would have decayed to approximately half its initial value (43.5 pCi/L). Likewise, after two half-lives (7.64 days), it would be about a quarter of the initial value (21.75 pCi/L). As the time period in your question is just slightly more than two half-lives, the radon activity in the container after 8 days will be slightly less than 21.75 pCi/L. Therefore, the closest answer in your list would be option B (21.8). However, please note, the actual value might be slightly less depending on the exact calculation.
Learn more about Radon Half-life here:
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