Investigation on shielding reconstruction with clay bricks for medical linear accelerator room
10.7687/j.issn1003-8868.2017.07.081
- VernacularTitle:医用直线加速器机房屏蔽防护改建研究
- Author:
Wei SONG
1
;
Di ZHAO
;
hai Da YU
;
chen Xin SUN
;
kai Jin LI
;
zhi Xi ZHANG
;
Jun LI
Author Information
1. 江苏省中医院放疗科
- Keywords:
medical linear accelerator;
machine room shielding;
shielding calculation;
dose rate estimation;
clay brick
- From:
Chinese Medical Equipment Journal
2017;38(7):81-84,88
- CountryChina
- Language:Chinese
-
Abstract:
Objective To provide a solution to improve the radiation shielding for medical accelerator room with clay bricks.Methods According to the basic shielding equations provided by the relevant national standards and international reports,equations for shielding reconstruction calculation were derived to calculate the required thickness of clay bricks wall,which reached the reference dose rate control level.The dose rates at reference points after reconstruction were also estimated based on the measured dose rates at reference points before reconstruction of accelerator room,calculated distance correction factors and transmission factors of added clay bricks wall.Results The measured dose rates satisfied the requirement of reference dose rate control level.The estimated dose rates were slightly higher than the measured values.Conclusion The radiation shielding requirement of medical accelerator room is fulfilled with the presented shielding reconstruction method by building clay bricks wall,measured dose rates could be conservatively predicted with the dose rates calculated by derived equations.
