Q: What type of radioactive decay is generally only dangerous when emitted inside the body?


Read this paragraph and choose the correct option from the provided answers:

All types of radioactive decay pose risks to living things, but alpha decay is the least dangerous. That’s because alpha particles are relatively heavy, so they can travel only a few centimeters through the air. They also are not very penetrating. For example, they can’t pass through a sheet of paper or thin layer of clothing. They may burn the skin, but they can’t penetrate to the tissues underneath the skin. However, if alpha particles are emitted inside the body, they can do more damage. One way this can happen is by inhaling cigarette smoke. People who smoke actually inhale the radioactive element polonium-210. It undergoes alpha decay in the lungs. Over time, exposure to alpha particles may cause lung cancer.

 Choices:

- ionic decay

- variant decay

- nucleus decay

- alpha decay


A:
alpha decay