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1/r**2 helps a lot. Unless you're right next to the projector you should be o.k. The HV rectifier does produce x-rays as does the CRT.
As ChuckA said, they are soft x-rays ranging from a very low energy up to the 25KV max. However, most of them are of lower energy and will be stopped by the case. It won't stop the higher energy x-rays though.
The glass has enough high Z elements in it to reduce the higher energy x-rays. The HV rectifier, because it's construction will only let the x-rays exit in a directional pattern. I don't know how it's oriented, but likely in a direction where they'll be stopped by the chassis.
If you are working on the HV section with the cover off, then you should probably minimize your time there out of an abundance of caution.
John
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