Current Status of Disposal and Measurement Analysis of Radioactive Components in Linear Accelerators in Korea
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When X-ray energy above 8 MV is used, photoneutrons are generated by the photonuclear reaction,which activates the components of linear accelerator (linac). Safely managing the radioactive material,when disposing linac or replacing components, is difficult, as the standards for the radioactive materialmanagement are not clear in Korea. We surveyed the management status of radioactive componentsoccurred from medical linacs in Korea. And we also measured the activation of each part of the discardedElekta linac using a survey meter and portable High Purity Germanium (HPGe) detector. We found thatmost medical institutions did not perform radiation measurements when disposing of radioactivecomponents. The radioactive material was either stored within the institution or collected by themanufacturer. The surface dose rate measurements showed that the parts with high surface dose rateswere target, primary collimator, and multileaf collimator (MLC). 60Co nuclide was detected in most parts,whereas for the target, 60Co and 184Re nuclides were detected. Results suggest that most institutions inKorea did not have the regulations for disposing radioactive waste from linac or the management procedures and standards were unclear. Further studies are underway to evaluate short-lived radionuclidesand to lay the foundation for radioactive waste management from medical linacs
Abstract
When X-ray energy above 8 MV is used, photoneutrons are generated by the photonuclear reaction,which activates the components of linear accelerator (linac). Safely managing the radioactive material,when disposing linac or replacing components, is difficult, as the standards for the radioactive materialmanagement are not clear in Korea. We surveyed the management status of radioactive componentsoccurred from medical linacs in Korea. And we also measured the activation of each part of the discardedElekta linac using a survey meter and portable High Purity Germanium (HPGe) detector. We found thatmost medical institutions did not perform radiation measurements when disposing of radioactivecomponents. The radioactive material was either stored within the institution or collected by themanufacturer. The surface dose rate measurements showed that the parts with high surface dose rateswere target, primary collimator, and multileaf collimator (MLC). 60Co nuclide was detected in most parts,whereas for the target, 60Co and 184Re nuclides were detected. Results suggest that most institutions inKorea did not have the regulations for disposing radioactive waste from linac or the management procedures and standards were unclear. Further studies are underway to evaluate short-lived radionuclidesand to lay the foundation for radioactive waste management from medical linacs
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