The following guides and links are good resources from which to learn about regulations regarding the use of hazardous devices and radiation.

1. Radiation Manual from the Center of Disease Control (CDC): www.cdc.gov/od/ohs/manual/radman.htm

2. Occupational Safety and Health Administration Documents available from:
OSHA Publications
PUB 8-1.7 - Guidelines for Laser Safety and Hazard Assessment

STD 1-4.1 - OSHA Coverage of Ionizing Radiation Sources Not Covered by Atomic Energy Act of 1954
http://www.osha.gov

3. S. Nuclear Regulatory Commission Material Safety and Inspection Branch http://www.nrc.gov