Question

Which of the following is NOT true?

• A. \( \text{Magnets (200 MHz-900 MHz) are made of superconducting wires} \)
• B. \( \text{Room temperature shims are in a liquid nitrogen vessel} \)
• C. \( \text{Liquid helium and liquid nitrogen are needed to maintain the magnetic field} \)
• D. \( \text{The magnet solenoid is in a liquid helium vessel} \)

Hint:

Superconducting magnets require ultra-low temperatures for stable operation in NMR spectrometers.

Answer 1

The Correct Option is B

Room temperature shims in an NMR system are not placed in a liquid nitrogen vessel, but rather positioned externally to adjust the static magnetic field homogeneity. Superconducting magnets require cryogenic cooling with liquid helium and nitrogen to maintain their functionality.