Hi, I bought an old CRT at a thrift for vintage gaming, it works but the screen flashes a lot, not unbearable but still noticeable. Anyway I was wondering, can old broken CRT monitors be dangerous in any way? Because I am going to let my kid play on it, and I wanted to make sure older monitors don't release radiation, chemicals, heavy metals, etc.
CRTs do tend to have heavy metals (for example lead) inside them, but if the case is intact, then it should not be an issue in terms of usage. It mainly becomes an issue when disposing of them.
The actual "tube" of the CRT can have a significant electrical charge, but again, if the case of the monitor is fully intact, then this will not be an issue. It is mainly an issue if you take it apart, for example to service it.