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The list below provides some essential safety pointers. However, it is not exhaustive, and users will learn more in the mandatory training sessions that must be completed before using the X-ray facility.

• Only trained personnel are permitted to operate our analytical XRD units.
• Follow all safety protocols at all times—no shortcuts.
• Be aware of the beam path at all times.
• Never place any part of your body in the direct beam path, even if the shutter is closed.
• Ensure all exposures are complete and the shutter is closed before entering the X-ray enclosure.
• Always check that the red shutter light is off before mounting or dismounting your crystals. Keep an eye on the indicator light when near the direct beam: the red light indicates the shutter is open, and it will turn off when the shutter is closed.
• Never bypass the safety interlocks for any reason.
• Close and lock the enclosure doors before starting any exposures.
• Do not use the door interlocks to close the shutter unless it is an emergency. Always close the shutter using the computer control outside the enclosure.
• Never make alterations to the XRD instruments.
• Always wear your dosimeter body badge when entering the X-ray enclosure.
• Always wear safety glasses, long trousers, and closed-toe shoes in the X-ray lab, especially when handling liquid nitrogen during crystal freezing and mounting.
• If in doubt, shut down the X-ray generator and contact the facility director, Dr Annette Erbse, or EH&S. Dr Erbse's mobile and home phone numbers are displayed throughout the X-ray facility, including on the safety enclosures of the XRD instruments and on the emergency contact cards at the doors to the X-ray lab. She is happy for you to call, even late at night, if you are ever uncertain about the safety of your experiment.

"I would rather lose a little sleep preventing an accident than a lot of sleep over the consequences of one!" — Annette Erbse

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