PHYS1008 Study Guide - Final Guide: Jackhammer, Expansion Ratio, Hyperthermia
2 Aug 2018
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Discuss safety considerations for staff and patients within and around an mri facility. Superconducting magnets made out of nobium-titanum alloy require liquid helium and liquid nitrogen: asphyxiation. The oxygen in the hair is below a level which supports life. Inhalation of helium in excessive amounts can cause dizziness, nausea, vomiting, loss of consciousness and death. Death may result for errors in judgement, confusion or loss of consciousness that prevents self-rescue: cold burns/frostbite/hypothermia. The eyes are the most sensitive body part to the intense cold of the liquid and vapours of cryogenic liquids (-273 c: explosion. In an emergency liquid helium from scanner must be vented directly and safely to the atmosphere. Must be open all the time in order for it to lead directly out. Peripheral magnetic field outside of the magnets core. For cylindrical superconducting scanners, the fringe fields are largest around the direction of the axis bore (along the z-axis/b0 direction)
