Which gas use in cooling tube in MRI tube ?

Options

A. He
B. Ar
C. `CO_(2)`
D. `N_(2)`

Explanation

To determine which gas is used in the cooling tube of an MRI (Magnetic Resonance Imaging) tube, we can follow these steps:

### Step 1: Understand the Function of the MRI Tube
The MRI tube operates using a combination of magnetic fields and radio waves to create detailed images of the internal organs.

**Hint:** MRI stands for Magnetic Resonance Imaging, which is crucial for understanding its function.

### Step 2: Identify the Need for Cooling
In MRI machines, superconducting magnets are used, which require cooling to maintain their superconducting state. This is essential for the efficient operation of the MRI.

**Hint:** Superconducting magnets need to be cooled to function properly.

### Step 3: Determine the Cooling Agent
The most commonly used gas for cooling in MRI tubes is helium. Helium is chosen because it remains in a liquid state at very low temperatures and has excellent thermal conductivity.

**Hint:** Think about gases that can remain liquid at low temperatures and have good thermal properties.

### Step 4: Review the Options
If options are provided, we would check which one mentions helium. The other gases like argon, carbon dioxide, and nitrogen do not serve this purpose in MRI systems.

**Hint:** Eliminate options that are not typically used for cooling superconducting magnets.

### Conclusion
The gas used in the cooling tube of an MRI tube is **helium**.

**Final Answer:** Helium gas is used as a coolant in the MRI tube.