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As to the front face, bonded or un-bonded there is the protection of x-ray shielding if followed in early interchangeability instructions as well as implosion protection. Even if the front glass is not leaded it would provide protection from "soft" x-rays being emitted as there is that "additional layer". Granted, leaded glass is better I know. The manufacturers' had to ensure precautions from a liability/safety standpoint as well as maintaining interchangeability standards for tube replacement back in the day.
As many of us may have noticed, a curved face for a 21FBP is about twice as thick as a 21FJP. The bonding does make up for some difference though.
I do believe we are plenty safe after doing cataract surgery although I will still maintain my distance!
I know of a retired CRT rebuilder and when he's back in town I'll run have to run this past him.
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