125I粒子植入前装载过程中医护人员的剂量监测

Monitoring of radiation dose to medical staff during 125I seeds loading

目的 分析1255I粒子装载过程中医护人员的受照剂量.方法 采用热释光剂量计检测125I装载过程中,与粒子槽不同距离的剂量,计算出人员的安全范围;医护人员的受照剂量、剂量率和年累积剂量.结果 与粒子槽不同距离处10、20、30、40、50和100 cm的剂量衰减率分别是77.61％、98.04％、98.79％、99.30％、99.71％和100％.医护人员的指尖、胸部、眼晶状体和甲状腺的受照剂量分别是51.08、35.50、34.73和33.78 μGy,年操作250次达到的剂量分别是12.77、8.88、8.68和8.45 mGy.铅玻璃屏内、外粒子剂量的衰减率分别是28.36％、79.60％.结论 125I粒子装载过程中,安全距离超过100 cm时检测不到辐射,铅玻璃防护是很有必要的.

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.