The only other danger with gas cylinders is if they fall over. If a gas cylinder does not have its safety cap on, the valve at the top can break and the cylinder can turn into a torpedo. If it does have the safety cap on, the danger is that it's heavy and can seriously hurt someone if it falls on them. To prevent cylinders from falling over, they are chained to the walls or built-in benches in the labs. If you see a cylinder in a laboratory that has not yet been chained, be careful not to bump it.
Radiation is used in some of our labs.
The radiation level is very low and presents no real danger, but you must still be careful when you're working around any radiation. Learn to recognize the radiation symbol. Some bench tops will have areas covered with paper and bordered by tape with the radiation symbol on it. Work with radiation is done in that area and nothing should be put on it. If your work requires that you work in an area labeled with the radiation symbol, do not begin your work without close coordination with the room occupants or the Research Director.