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Problem 9: Answer the following questions based on the graph of a radioactive iodine isotope shown to the right.

Part (a) What is the half-life of the material in days?

t = _________ days

Part (b) In how many days does the substance decay to one-fourth its original value?

t = _________ days

Radioactive decay of lodine isotope
100
87.5
75
62.5
50
37.5
25
12.5
8 16 24 32 40 48 56 64 72 80 88
Time of decay (days)
% of remaining lodine

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Problem 9: Answer the following questions based on the graph of a radioactive iodine isotope shown to the right. Part (a) What is the half-life of the material in days? t = _________ days Part (b) In how many days does the substance decay to one-fourth its original value? t = _________ days

Problem 9: Answer the following questions based on the graph of a radioactive iodine isotope shown to the right. Part (a) What is the half-life of the material in days? t = _ days Part (b) In how many days does the substance decay to one-fourth its original value? t = _ days