A particular fast-moving particle travels several feet in open air and is easily stopped by a solid material. Acute exposure is rare, but chronic effects occur from long-term exposure. Which of type of particle is most likely being described?

Beta particles can travel several feet through air but are stopped by materials such as plastic or thin metal. Alpha particles travel only a short distance in air, while gamma rays and neutrons are much more penetrating. Therefore, beta particle is the best match.

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