Cryogen Safety Flashcards
6 cards from real MRSO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Cryogen Safety flashcards as text
What is the primary and most immediate danger to personnel inside the magnet room during a quench?
Answer: Asphyxiation due to oxygen displacement
During a quench, liquid helium rapidly boils off into a massive volume of helium gas, which displaces the oxygen in the room. This creates a significant and immediate risk of asphyxiation if personnel cannot evacuate the room instantly.
What is the minimum required Personal Protective Equipment (PPE) when handling or transferring liquid cryogens?
Answer: Insulated gloves, a face shield/goggles, and closed-toe shoes
Handling cryogens poses severe risks of frostbite from skin contact and permanent eye damage from splashes. The minimum required PPE includes insulated (cryogenic) gloves, a face shield or safety goggles to protect the face and eyes, and fully enclosed shoes to protect the feet from spills.
Where is the proper location for storing a dewar of liquid helium?
Answer: In a well-ventilated area, away from patient care areas
Cryogen dewars must be stored in a well-ventilated area to prevent the buildup of gas from normal, expected boil-off. Storing them in a sealed room could lead to an oxygen-deficient atmosphere, creating a serious safety hazard.
An oxygen (O2) monitor in the magnet room alarms, showing a level of 18.5%. What is the appropriate first action?
Answer: Immediately evacuate all personnel from the magnet room
An oxygen level below 19.5% is considered an oxygen-deficient atmosphere by OSHA, and 18.5% represents a significant danger to life. The immediate priority is to evacuate all personnel from the potentially hazardous environment before taking any other action.
What is the primary function of the quench pipe or vent?
Answer: To safely vent helium gas outside the building during a quench
The quench pipe is a critical safety feature designed to direct the massive volume of helium gas generated during a quench away from the magnet room and safely outside the building. This prevents a catastrophic pressure buildup and asphyxiation hazard within the facility.
In the event of a small liquid nitrogen spill on the floor in a well-ventilated service area, what is the correct procedure?
Answer: Evacuate the immediate area and allow it to evaporate naturally
For a small spill in a well-ventilated space, the safest action is to secure the area to prevent personnel from walking through it and allow the liquid to evaporate on its own. Actively trying to clean it or adding other substances can be hazardous and may increase the rate of gas expansion.