快中子治癌束剂量特性研究  

RADIATION DOSE CHARACTERISTIC STUDY OF A FAST NEUTRON THERAPY BEAM

作　　者：常崴克[1] 唐锦华[1] 罗醒萱[1] 张苏[1] 张仲纶[1] 苏震[1] 刘成祥[1] 郑雁珍[1] 

机构地区：[1]中科院高能物理研究所,中科院生物物理研究所

出　　处：《辐射防护》1994年第4期256-261,共6页Radiation Protection

摘　　要：我国第一台中子治癌装置由３５ＭｅＶ质子＋Ｂｅ反应产生的快中子束已在临床中取得初步结果。其剂量测试系统的监测室积分电荷－标准体模内中子吸收剂量校正因子ｋ＿（ｃｏｒ）值，在标准源皮距（１３７，３ｃｍ）、标准射野（９ｃｍ×９ｃｍ）和深度９ｃｍ条件下测得，在半年内２０次测量的相对标准差为±０．６３％。本文研究了不同射野尺寸对水模体内中子束深部剂量曲线的影响，大的射野尺寸将获得较高深部剂量。对于上述标准射野和源皮距，１０ｃｍ深处相对水模体前表面的剂量为５２％，与美国费米实验室相近几何条件下测得的中子束的相时深部剂量（６３％）相近。离轴比为１０．５％，略优于费米实验室的（１４／）。The primary results of clinical therapy by a fast neutron beam generated fromthe first neutron therapy equipment in China were obtained.Deviation of k_(cor) of the dose measystem,the correction fact0r of neutron absorbed dose in integrated charge-stan-dard phantom,was ±0.63%,when the standard source-skin distance was 137.3cm,standardbeam field size 9 cm×9 cm and the depth 9 cm. In this paper,the effect of fields size on neutron beam depth dose distribution were investigated.A higher depth dose would be obtainedwith a bigger field.At depth of 10cm,per cent depth dose is 52%,which was close to 63% of the result by Fermi lab.OAR is 10.5%,which was slightly better than 14%of Fermi lab′sresult.

关 键 词：中子剂量 肿瘤 放射疗法 快中子 

分 类 号：R730.55[医药卫生—肿瘤]