Answer :
Final answer:
Argon is the type of gas commonly used for gas ionization in CT detectors due to its ionization properties and inert nature.The answer is 3) Argon.
Explanation:
Among the types of gases listed, argon is commonly used for gas ionization in CT detectors. Argon is a member of the noble gases group in the periodic table, known for their lack of reactivity at room temperature and pressure, which makes them ideal for use in environments where a non-reactive or inert atmosphere is required. In contrast to gases like nitrogen, oxygen, and helium that have other primary uses in gas chromatography, argon is preferred in ionization detectors because of its ionization properties and stability.
