Radiological protection assessment of construction project based on a new type of head γ knife

Objective To evaluate the effectiveness of radiological protection and facilities for a new type of head γ knife to ensure the health and safety of the construction personnel. Methods According to the national relevant regulations and standards, the new type of γ knife and other materials were submitted by the construction unit, and the results of field investigation and detection of radiation protection were combined. All the materials were comprehensively analyzed and evaluated for safety and effectiveness. Results The performance test results of the new γ knife met the requirements of GBZ 168-2005. The ambient dose equivalent rate in the workplace was 0.11 μSv/h to 0.18 μSv/h; thus, shielding requirements were needed for radiological protection. In the radiological protective facilities, the health examination system and its corresponding rules and regulations were reasonable. Conclusions The construction of the γ knife can effectively control the risk factors of radioactive occupational diseases, and the radiation protection facilities can meet the requirements for approval to complete the construction. Key words: Radiation protection; γ knife; Construction project; Assessment