I need to access to a control zone where I am required to carry a personal dosimeter. Can I borrow the dosimeter of my colleague if I forgot to take mine?

The personal dosimeter records radiation doses received by the person to whom it belongs and must be use only by that person.  The doses are recorded following procedures and modalities agreed between CERN and the Host States. If you borrow and use the dosimeter of your colleague, that will prevent CERN from correctly measuring the received doses, and from complying with its obligations with the Host States. It is important to remember the consequences that our actions can have on our security, the security of our colleagues and of the public, the environment, and CERN.