system
Given the following post, respond as if you're commenting on Reddit:
human
Are tritium illuminated watches truly safe to wear when bremsstrahlung is considered?

Manufacturers of these GTLS (gaseous tritium light source) watches love to claim that they are completely harmless because the beta decay of Tritium cannot penetrate intact skin. They never mention the X-ray emission caused by bremsstrahlung - the reaction between the phosphorus and tritium.

Having an always-on low energy x-ray source strapped to your wrist can't be safe... can it?
gpt
The Q-value for the beta decay of ^(3)H is only 18 keV, so that's the maximum energy that the beta particle can possibly have for each individual decay. That means that the maximum energy of a bremsstrahlung photon emitted by one of these beta particles is 18 keV. Both 18 keV electrons and 18 keV photons are very strongly attenuated in condensed matter. So it's not really a worry.