RESUMEN
Objective: To monitor the protecting effect of lead apron of accelerator staff against radiation in treatment room (dose and damage of residual radiation). Methods: In the protection experiment about lead apron, thermoluminescence dosimeter (TLD) was applied to monitor the dose corresponding various point of inside and outside of lead apron. Under the same condition of radiation, the first test aimed at un-metal dressing (the work pants without metal zipper and metal button) and the second test aimed at jeans (those with one metal zipper and one metal button). At front of the apron, there were 3 points (Left, Middle and Right) of inside and outside were monitored, respectively. And at behind, the body without shelter from apron were tested at 3 points of wearing, and then the average effective dosage were calculated. Results: ①The averagely effective dosage of inside of lead apron was significantly higher than that of outside at the first test (t=0.0002, P<0.01). And the average effective dosage of inside of lead apron was still significantly higher than that of outside at the second test (t=0.0158, P<0.05).②The averagely effective dosage of various points behind body of second test was significantly higher than that of the first test (t=0.0005, P<0.01). ③The differences of averagely effective dosages of inside and outside of lead apron between the second test and the first test were no significantly (t=0.0991, t=0.0537, P>0.05), respectively. Conclusion: Only using lead apron can't achieve prospective protection effect and it even can increase the radiation dosage for accelerator staffs, especially for woman of childbearing age. Hospital should strictly implement relevant stipulations of ICRP, IBSS and CBSS and staff should not wear any accessory with metal material. Besides, the relevant method that can reduce radiation dosage and protect health should be written in operation instruction or guidelines.