Answer the following question given this paragraph: 

Of the three basic types of emissions, gamma radiation has the highest penetrating power. Thick, high density materials (such as lead) are required to stop gamma emissions. The thickness of the shielding will determine the effectiveness of the protection offered by the lead.


Q: Of the three basic types of emissions, which has the highest penetrating power?

 Choices:

- ultraviolet radiation

- fluid radiation

- chemical radiation

- gamma radiation

A:
gamma radiation
