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I'm from the Radiation Environment Supervision Department. Let me help you solve it.

First of all, what you see belongs to outdoor flaw detection, which is a kind of flaw detection. Outdoor flaw detection has a certain protective distance, which will not cause harm to human body after reaching a certain distance.

Secondly, outdoor nondestructive testing belongs to the second-class ray device, and 5 seconds of irradiation will not cause harm to your body.

Don't burden your mind. I believe you haven't received much dose in these five seconds. Even if exposed to radiation, it will not cause harm to the body, because people are exposed to all kinds of radiation in nature, natural radiation and electromagnetic ionizing radiation, which is normal.