People who get any type of radiation therapy are often worried about whether the radiation poses a risk to themselves or to others around them.

If you get external beam radiation therapy, you are NOT radioactive and do not need to take special precautions to protect others from radiation. Treatments are given in special rooms that contain the radiation. The radiation therapist is not in the room during the treatment but can see you and talk with you over an intercom the whole time.

If you are given a radiopharmaceutical such as radioactive iodine, it will leave the body within a few weeks, mainly through the urine, but also through saliva, sweat, and stool. In order to reduce exposure to others, you will be asked to follow some basic instructions for the first few days after treatment. Your health care team will tell you about specific precautions, which could include:

• good hand washing after using the toilet
• flushing the toilet twice after each use
• using separate eating utensils and towels. (Laundry may need to be washed separately.)
• drinking plenty of fluids to help flush the radioactive iodine from your body
• not kissing or having sexual contact
• keeping a distance of one arm's length between yourself and any others who spend more than 2 hours next to you in any 24 hour period; especially avoiding prolonged contact with infants, children, and pregnant women, and even pets.

With internal radiation therapy, the radioactive material is sealed in a metal container. For a temporary implant, you will need to take special precautions only while the implant is in place to avoid exposing others to radiation. With this type of radiation, body fluids such as urine, sweat, blood or stool are usually not radioactive and probably will need no special handling. Your health care team will give you more specific instructions.

If you need to stay in the hospital while you are getting internal radiation therapy, you will most likely be in a private room. Although the nurses and other people caring for you will not be able to spend a long time in your room, they will give you all of the care you need. There will also be limits on visitors while your implant is in place. As a precaution, most hospitals do not let pregnant women or children younger than 18 visit patients who have an implant. Visitors should sit at least 6 feet from your bed and stay for only a short time (less than 30 minutes each day).

Permanent implants use weaker radiation, and patients can usually go home after the implant procedure. If you have permanent implants, such as seed implants, you may need to avoid close contact with other people for the first few days while the radiation is most active. The implant will lose energy each day. For a few weeks or months after the implant, you may be told not to have daily close contact with pregnant women or children for more than just a few minutes. Use of a condom during sex is often recommended for a short period of time. Your health care team will let you know if there are any special precautions you need to use at home.

Go back to Radiation Principles.

Last Medical Review: 07/17/2009
Last Revised: 07/17/2009