Final answer:
Gamma radiation can travel far in air but can be stopped by materials like aluminum. It requires dense elements like lead for effective shielding.
Explanation:
Gamma radiation is the type of radiation that can travel a considerable distance in air but can be reduced or stopped by a layer of clothing or a few millimeters of a substance like aluminum. Gamma radiation is highly penetrating and can pass through thick layers of most materials, requiring dense elements like lead for effective shielding.
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