Be rest assured Ben’s previous job was in the medial imaging industry. While he worked on MRI machines rather than ionizing radiation, I think he’s very well aware of the dangers of X rays and has many projects dealing with ionizing radiation. There’s a lot of bad safety science YouTubers, Ben isn’t one of them :)
Funny thing: it’s actually rare to get radiation damage to human hands and feet since there’s not too much growing tissue there!