^(60)Co重过滤低剂量率照射剂量学  

Dosimetry of ^(60)Co γ-ray Low Dose Irradiation on Spleen

作　　者：窦绍宇[1] 李涛[1] 吴大可[1] 李欣 

机构地区：[1]四川省肿瘤医院放疗科,四川成都610041 [2]宜昌市肿瘤医院放疗科,湖北宜昌443000

出　　处：《中国医学物理学杂志》2004年第3期129-130,134,共3页Chinese Journal of Medical Physics

基　　金：四川省卫生厅科学基金资助项目(980023)

摘　　要：目的:探讨低剂量60Coγ射线照射由于照射物理条件不同剂量学参数的变化。材料和方法:在常规照射和低熔点铅(LML)重过滤初始γ束条件下,用三维水箱自动测量装置和剂量仪分别测量PDD、OAR和绝对剂量定标后的K修正系数。结果:60Coγ射线初始束经重过滤后PDD在人体脾脏靶区深度5cm～11cm区域平均降低1.2个百分点,OAR较常规60CoOAR圆弧化,绝对剂量较常规实际减弱80倍,并给出了治疗时间公式。讨论:对60Coγ射线的重过滤,是采用常规60Coγ射线治疗机实现低剂量辐射照射脾脏的最佳方法。Objective: To study the dosimetry of Heavy Filter Low Dose Rate(HFLDR) 60Co γ-ray under the different physical conditions. Material and methods: The values of PDD, OAR and the correct factor K of absolute dose were measured with 3D-water-tank, and Farmer 2570 dosimeter for open fields and low melting point lead heavy filter fields, respectively. Results: The average PDD of low-melting point lead heavy filter fielts is 1.2 percent lower that those of open fields on 5 cm～11 cm depth, the OAR is more blunt for low-melting point lead heavy filter fields than open fields,absolute dose for open fields were 80 times higher than those of low-melting point lead heavy filter fields, respectively, and the formula calculating the therapeutic time was established. Conclusions: The optimal way applying the low dose rate 60Co γ-ray for irradiating the spleen is discussed in the text.

关 键 词：低剂量 重过滤γ射线 ^60CO 

分 类 号：R732.1[医药卫生—肿瘤]