Monitoring of radiation dose to medical staff during 125I seeds loading / 中华放射医学与防护杂志

ABSTRACT

Objective To analyze the dose of radiation to medical staff during 125I seeds loading Methods The radiation dose at different distances was measured by using thermoluminescence dosimeters (TLD),and the safe range for medical person was calculated.The doses and annual accumualive doses to the medical staff were estimated.Results The dose attenuation rates were 77.61％,98.04％,98.79％,99.30％,99.71％ and 100％ at distance of 10,20,30,40,50 and 100 cm from seeds tank,respectively.The dose to fingertips,chest,lens and thyroid of doctor were 51.08,35.50,34.73 and 33.78 μGy,and the annual dose reached 12.77,8.88,8.68 and 8.45 mGy when the number of annual operations was 250.The attenuation rate was 79.60％ and 28.36％ of inside and outside lead glass,respectively.Conclusions The radiation is undetectable at 100 cm away from seeds tank in the process of loading of 125I seeds,and lead glass is necessary for radiation protection.