I've talked to friends, science professors and healthcare professionals who told me that any amount of radiation increases a person's risk for cancer. I have also done some reading about it. So even if there was a small amount of exposure, the chance increases. A friend told me that there may be residual radiation coming from machines even when they are turned off and that I would be exposed to it as a nurse since I would be helping bring patients to and from the machines. I'm not sure if that is true though.