Objective To analyze personal dose of occupational external for radiation in radiological professionals in Ningbo, and to provide basis for the assessment of radiation protection and physical dose of radiological accidents in workplace.
Methods Thermoluminescence dosimetry was used to detect the personal radiation dose of radiological professionals in selected medical institutions and factories in Ningbo.
Results Of the 1 563 participants investigated, the average annual individual dose equivalent was 0.298 0 mSv in 2011, among whom 1 528 participants were at individual averages lower than 2 mSv, 28 were between 2 mSv and 5 mSv, 5 were between 5 mSv and 20 mSv, and 2 exceeded 20 mSv. The highest average annual dose equivalent were found in medical staff from township and private clinics, followed by professionals that engaged in county level hospitals, factories, and municipal hospitals. The radiotherapists received the highest personal dose of external radiation, while the technicians responsible for accelerators did the lowest.
Conclusion The occupational external radiation exposure is generally at a low level for radiological professionals in Ningbo and the radition protection work goes well.
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