Can you get radiation from patient undergoing treatment?

If someone say myself slept with a woman who was going through chemo treatments for Breast cancer. Would I be harmed by the radiation she went through?

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First, chemo is not radiation- it is chemical. It can be COMBINED with radiation. Radiation TREATMENT can take a couple of forms- radiation administered at a health care facility, and implanted sources of radiation. The first type stops when the treatment stops- no significant residual radiation. The second type involves very small quantities of radioactive materials implanted at the site to be treated. These are shielded by being inside the body.

Bottom line- no you are not exposed to any significant amount of radiation. We are all exposed to tiny amounts of natural radiation simply from living- it is called background radiation. You will get more radiation from standing in sunlight for an hour than from sleeping next to your partner. I would urge you to talk with your partner's doctor- they are accustomed to answering questions.