Finding the Half Life From Activity

AI Thread Summary
To determine the half-life from activity data, the initial assumption is that it occurs when the activity is halved. The user calculated a half-life of 2.34 minutes based on halving the initial activity of 36,506, but the textbook states the half-life is 1 minute. Confusion arises as the user questions how the answer can be in minutes when the timing spans hours. A review of the table indicates that the correct half-life is indeed 1 minute, not 2.34 hours. Clarification on the relationship between activity and time is needed to resolve the discrepancy.
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I am meant to deduce the half life from this table (as attached.) I was under the impression that the half life would occur when the initial activity was halved but my answer of 2.34 minutes (from halving the initial activity of 36506) is wrong. Instead, the answer the textbook got was 1 minute. What did I do wrong?
 

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Are you sure these things are related? How can the answer be in minutes when the timing was over hours?
 
The answer was one minute and I got an 2.34 hours (my mistake.) I'm not sure what to do now...
 
The answer of one minute does not match with this question.A quick glance at the table shows the answer is over two hours.
 

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