Measurement and evaluation of personal radiation dose in cyclotron center and PET-CT department

Objective To measure and evaluate the personal radiation dose for medical staff in cyclotron center and PET-CT department and to offer the reference data for clinical radiation protection.Methods γ ray radiation dose rate was analyzed in 18 medical staff members during each medical procedure by using X and γ radiation detector.The estimation of annual exposure dose of 18 medical staff at different working site was based on the caculation of doserate(d),work time(t) and workload(w).Results When the workloads were 1 000,4 000,7 000 and 10 000 per year,the annual doses per procedure were: 0.27 mSv for quality control;0.02 to 0.20 mSv for dispensation;0.06 to 0.58 mSv for carrying the compound;2.49 to 24.9 mSv for injection and 1.19 to 11.91 mSv for setting the patients.Conclusion The staff receives higher radiation dose during dispensation and injection.When the workload is 4 000 and 10 000 per year,the dose received by hands and body would respectively exceed the national radiation safety standards(GBSS) on occupational annual dose limits.