Print View Posted on: 26 August 2015
This is an isotope manufacturing facility. The licensee technician needed to transfer a Co-60 source drawer into a shielded container called a therapy head. A special handling tool had been bolted to the end of the source drawer and this tool was needed to safely transfer the source back inside the therapy head. The technician attempted to move the source drawer in order to gain access to the handling tool but the source drawer was stuck, so the technician pulled on the drawer. In doing so, the drawer slid out of the cask about 22.8 cm (9 inches), bringing the source to within an estimated 5.1 cm (2 inches) of the cask external surface and exposing the technician. The technician quickly pushed the source drawer back inside the cask and noted that the electronic personnel dosimeter (whole body) being worn by the individual was reading 56.2 mSv (5.62 rem). The technician was not wearing extremity dosimetry. The technician immediately left the area. The licensee’s preliminary calculations are a whole body dose of 169 mSv (16.9 rem). Depending on various assumptions, the extremity dose is estimated to be between 2,370 mSv and 9,500 mSv (237 to 950 rem). The technician’s badge has been sent for emergency processing and the individual is being restricted from radiation work for the time being. NRC EN51331