Probably not. Based on the community answers, standard airport X-ray scanners are not strong enough, during the brief exposure of normal screening, to damage a vintage selenium-cell light meter or noticeably affect its accuracy. Selenium cells have been used in many cameras and meters over the years, and short scanner exposure is not considered a risk.

If you are still worried, you can ask for a manual inspection or use an X-ray-blocking pouch, though those are more commonly used for film. As a general rule, film—especially higher-speed film—is more vulnerable to repeated X-ray exposure than a selenium light meter.