Dose distribution due to neutrons and photons resulting from negative pion capture in tissue.
Dose distribution due to neutrons and photons resulting from negative pion capture in tissue.
复制标题
组织中负π介子捕获产生的中子和光子引起的剂量分布。
DOI：
10.1088/0031-9155/18/6/002
复制
发表时间：
1973
影响因子：
3.5
通讯作者：
D. Roeder
中科院分区：
文献类型：
--
作者：
M. E. Schillaci;D. Roeder
用蒙特卡罗输运程序计算了放射治疗中使用负π介子时产生的中子和光子的剂量分布。用于计算的简单模型假设在组织球体内居中的球形均匀停止区域。使用0.01、0.1和1升的治疗体积，代表肿瘤大小的范围。与中子剂量相比，光子剂量可以忽略不计。曲线的中子剂量作为半径的函数内的球体的组织。治疗体积外输送的平均剂量范围为总治疗剂量的0.012%至0.91%。它的结论是，二次剂量附近的器官，由于中子产生的π介子的“明星”不会严重限制实用的π介子放射治疗，但是，位于附近的重要结构大治疗体积可以收到显着的剂量。
The dose distributions due to neutrons and photons produced when negative pions are used in radiotherapy are calculated using a Monte Carlo transport program. The simple model used for the calculation assumes a spherical, uniform stopping region centred within a sphere of tissue. Treatment volumes of 0.01, 0.1 and 1 litre are used, representing a range of tumour sizes. The photon dose is found to be negligible in comparison to the neutron dose. Curves for the neutron dose as a function of radius within the sphere of tissue are presented. The average doses delivered outside of the treatment volumes range from 0.012% to 0.91% of the total treatment doses. It is concluded that the secondary dose to nearby organs due to neutrons produced in pion 'stars' will not severely limit the utility of pion radiotherapy; however, vital structures located adjacent to large treatment volumes can receive significant doses.