What harm does the person with bad heart have under X-ray for a long time?

According to the information you provided, often under X-ray, it is easy to cause granulocytopenia, decreased resistance and easy to catch a cold. At the same time, there are heart problems, which may increase the burden on the heart and aggravate the condition.

Suggestion:

I suggest you pay attention to protection. If you are a staff member, you must protect yourself according to national standards. If it is other personnel, try to avoid frequent contact.