RT Journal Article SR Electronic T1 Cancer risks and radiation JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 785 OP 786 DO 10.1136/oem.2009.048363 VO 66 IS 12 A1 David B Richardson YR 2009 UL http://oem.bmj.com/content/66/12/785.abstract AB