Personnel radiation exposure analysis in a radiotherapy center: fourteen year retrospective study.
The radiation exposure to the staff in the Ontario Cancer Institute between 1964-1977 was analyzed based on data from personnel film monitors. The annual collective dose equivalent was found to vary from 320 to 720 person-mSv. Of this, about 75% was attributable to the use of radionuclides for intracavitary and interstitial therapy, about 17% the use of external radiation therapy equipment, and the remaining, about 8% was equally attributable to diagnostic X ray and a mixture of many radiation sources used in research. The most influential factor to the annual collective dose equivalent was the number of patients treated with intracavitary and interstitial therapy. The dose per such application to this population was about .70 mSv, and was further broken down into .48 mSv to nurses in the wards where these patients were admitted, .11 mSv to personnel who handle these sources, .08 mSv to the operating room staff, and .04 mSv to the others. The collective dose per external radiation daily treatment was about .0008 mSv. For a course of 20 treatments, the collective dose equivalent will be in the order of .02 mSv. For diagnostic radiology, the collective dose per patient visit was in the order of 0.0003 mSv.
D001918:Brachytherapy; D002173:Cancer Care Facilities; D006782:Hospitals, Special; D006801:Humans; D010564:Personnel, Hospital; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011859:Radiography; D011868:Radioisotopes; D011878:Radiotherapy
D011868:Radioisotopes