I urge you to contact your Radiation Safety Officer (RSO) in your facility, as
the authority and knowledgeable person (and the one responsible for maintaining radiation exposure safety in your facility), to answer your questions and concerns.
You may want him/her to arrange an inservice for the other staff members, and to provide patients and staff with any written information about the potential risks to family members/staff.
Our Nuclear Medicine Technologists *should* be educating the patients on proper precautions after being injected with radioactive isotopes.
I've included two links below for educational purposes. One informative link is from Duke University, the other is from Medical University of South Carolina. Both specifically seek to educate Nursing personnel about radiation exposure and safety.
Hope they help, and do speak with your RSO!
http://www.safety.duke.edu/radsafety/nurses/default.asp
http://www.musc.edu/fanda/risk/radia...etrainmain.htm