Health and Safety in the EM laboratories

The following safety considerations are specific to the EM laboratories

Please note that the EM laboratories are for authorized personnel only and must be labeled as such. For general departmental safety information, please click here. A copy of the following safety information can be found on the notice board in the laboratory.

General Laboratory Safety

Liquid nitrogen



Electron microscope emergency shut down

In the case of an emergency, such as a fire or a building evacuation, follow the instructions below. However, personal safety remains a priority at all times and by no means should you put yourself at risk.

Sulphur hexafluoride gas

The FEG microscope uses sulphur hexafluoride gas (SF6) for insulation of the high tension (HT) tanks and the emission chamber of the F20. The gauge on the HT tank should read 4.5 bar. If the pressure drops below 4 bar, there may be a leak. While this gas is non-toxic it is heavier than air, and will displace oxygen from the floor level upwards. If there is a significant leak of this gas the oxygen monitor in the room will beep. The microscope will automatically switch off and the room should be evacuated according to the following procedure.

This page was last updated in October 2012