 Radiotherapy is an effective tool to fight cancer, but only if the right dose is applied. If the dose is too high, it may be harmful for the patient. If the dose is too low, the cancer cells will not be destroyed and the patient will not be cured. The IAEA Dosimetry Laboratory helps hospitals worldwide ensure their radiotherapy equipment is well calibrated. We have helped 2300 centers around the world in about 135 countries. Small devices for measuring radiation, known as dosimeters, are sent to hospitals where they are irradiated. The IAEA then checks if the dosimeters receive the exact intended dose. A dosimetry audit is a way to ensure and to check that the dose that the physicists and the radiation oncologists are giving on a specific machine is the correct dose that they think it is. A new medical linear accelerator has been installed in the laboratory. Linux use electricity to generate high-energy radiation beams to destroy cancer cells. A specialized facility has been built to house the machine. The new Linux will allow us to provide more training for many member states and will also be able to do research to develop new codes of practice in new areas. It also allows us to offer new audit services that we weren't able to offer before. The Dosimetry Laboratory is one of eight IAEA nuclear application laboratories in Cybersdorf, Austria. The new linear accelerator facility is part of the Renewal Project, an ongoing effort to modernize the agency's labs. It is the first major element of the project to go into operation.