Final answer:
You should obtain a medical letter or certificate explaining any residual radiation from treatments when going through airport security screenings, inform airline and CATSA staff ahead of your travel, and present the documentation at non-passenger screening locations to avoid delays.
Step-by-step explanation:
If you have undergone medical treatments or tests that may have left you with a trace amount of radiation in your system, it's important to be prepared for airport security screenings, especially those conducted by CATSA (Canadian Air Transport Security Authority). Individuals in this situation may set off radiation detectors at airports. To avoid delays and ensure a smooth passage through security, you should obtain a letter or a certificate from your doctor or the hospital where you were treated. This document should explain that you have undergone a medical procedure that has left residual radiation and may trigger alarms at security checkpoints.
Preparation and communication are key. Prior to your travel date, inform the airline and security personnel of your condition and provide them with the necessary documentation. Additionally, it is advisable to carry your prescription and any other relevant medical identification. When you arrive at a non-passenger screening location, notify the security staff immediately about your condition, and present your medical letter or certificate for verification. Following these steps will help ensure that you can pass through security with minimal inconvenience.