Iodine-131, T_1/2 = 8

question 52

Multiple Choice

Iodine-131, t_1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 10¹⁸ β particles per day, how long will it take for the activity to drop to 6.22 × 10¹⁷ β particles per day?

• A)2.0 days
• B)16 days
• C)32 days
• D)128 days
• E)None of these choices are correct.

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Definitions:

Levels

Distinct categories or stages that variables in an analysis or experiment can take.

ANOVA Table

A table used in analysis of variance (ANOVA) that displays the variance between and within groups along with associated statistics such as degrees of freedom, sums of squares, and mean squares.

Critical Values

Specific points on the scale of a test statistic that define regions where the hypothesis test will reject the null hypothesis in favor of the alternative.

Replicate

To duplicate an experiment or study with the aim of verifying the original findings.