Consider the table below that summarizes the types of materials that can block the 3 different types of radiation.Material123LeadStoppedStoppedStoppedClothNot stoppedStoppedStoppedAluminum foilNot stoppedStoppedStoppedWoodNot stoppedStoppedStoppedPaperNot stopped StoppedNot stoppedThick concreteStoppedStoppedStoppedBased on the table, at which numbered spot in the table does each type of radiation belong?
Answer
A
1 = beta; 2 = alpha, 3 = gamma
B
1 = alpha; 2 = beta, 3 = gamma
C
1 = beta; 2 = gamma, 3 = alpha
D
1 = gamma; 2 = alpha, 3 = beta
Explanation
Paper stops alpha radiation, so the column marked as stopped by paper is 2, making 2 = alpha. Column 1 is stopped only by lead and thick concrete, which identifies the most penetrating radiation: gamma. That leaves column 3 as beta, so the correct choice is “1 = gamma; 2 = alpha; 3 = beta.”
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