Is it true that cancer patients should not be exposed to too much radiation?

is it true they should avoid talking on the phone, text-messaging, watching tv etc.?
ould be a difficult study to do.
Which cancer patients would be studied?
There are so frequent different cancer types and treatments.
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would you have a control group not exposed to these electronic devices?
You would have to make a group of patients not monitor TV or use the phone?
Acute leukemia treatment is a long drawn out process with a lot of waiting around for the normal bone marrow cell to regenerate. I think it would be cruel to take away TV and phone privileges for the weeks or months of hospital time required to gain a remission.
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