Objective To monitor the radiometric data of a selected blood irradiator to the surrounding environment and the accumulated radiation dose received by operators, and to provide scientific basis for blood irradiator supervision in the future.
Methods From 2004 to 2011, environmental radiometric data of 451P γ-ray were acquired at different distances from a selected blood irradiator by γ-ray radiometric monitor. Personal accumulated radiation doses of machine operators were recorded by thermoluminescent dosimeters quarterly.
Results During operation, the maximum γ-ray dose-rate (0.78 μSv/h) was found at 0.05 m north from the blood irradiator, and the averages were 0.73 μSv/h at 0.05 m radius and 0.38 μSv/h at 1m radius. When the blood irradiator was switched off, the average dose rates at 0.05 m radius and 1m radius were 0.21 μSv/h and 0.13 μSv/h, respectively. For the operators, the annually accumulated doses ranged from 0.171 mSv/a to 0.186 mSv/a, and the average was 0.181 mSV/a.
Conclusion The blood irradiator is within the safe range of national occupational exposure standard and its environmental and personal radiation doses should be monitored regularly by operators.
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