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One thing that caused problems is in the mid 60s some cheaper sets were barely or not shielding the shunt regulator tube RCA installed it inside the HV cage but other makes even some RCA clones mounted it outside the cage with a crummy little skirt of shielding that only caught some of the X rays.
Normal viewing distance for a 21" set was 10 or more and air and any material attenuates X-rays greatly so at normal viewing distance from even the worst set you wouldn't see worse than background X-ray levels.
If it was a real problem then all the retired TV repairmen on these forums that spent 8 hours a day right next to running sets wouldn't be here to tell you about it...
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