P15. Update on the occupational exposure database at Groote Schuur Hospital

Abstract

Introduction The aim of this study is to look at the occupational exposure histories of all radiation workers at Groote Schuur Hospital since November 2011, when active tracking of the monthly exposure records began. Method and materials Every month over 300 individuals are monitored for radiation exposure at Groote Schuur Hospital. The TLD exposure records of more than 700 current or past radiation workers at the hospital since November 2011 have resulted in a database of over 21,000 unique entries. The radiation histories were divided into the various areas in the hospital and higher-risk areas were identified. Active tracking of the exposure records also allows for identifying individuals who consistently pick up non-zero exposures and may point to working practices that do not conform to the ALARA principle. Results In 93% of cases a zero dose was recorded, which enables low-risk groups to be identified. Three higher-risk areas were identified, which accounted for 84% of alleged overexposures: the catheterization labs, the vascular labs and the GIT units, all of which have fluoroscopic screening units. Doses above 4 mSv/month are queried by the regulator, but any dose less than that is automatically allocated. If a TLD badge is worn outside a rubber apron and the recorded dose is less than 10 mSv, the regulator allocates a 0 mSv dose, while a 2 mSv dose is allocated for readings above 10 mSv. Conclusion Active tracking of exposure histories has allowed the identification of higher-risk areas in the hospital. It also points to areas in the hospital in need of increased radiation protection awareness and training.