中低能氦和碳离子在纳米体积中径迹结构参数的测量
Measurement of track structure parameters of low and medium energy helium and carbon ions in nanometric volumes
摘要：
电离团簇的尺寸分布产生的离子计数无壁纳米剂量计的敏感体积的单能碳离子与能量之间的45 MeV和150 MeV的测量在TANDEM-ALPI离子加速器设施复杂的LNL INFN在Legnaro。在PTB的加速器装置上用241 Am α粒子源测量了能量在2 MeV和20 MeV之间的单能氦离子产生的辐射。使用C3 H8作为目标气体。在窄束几何形状中测量电离簇尺寸分布，其中初级束在距其中心指定距离处通过目标体积，并且在宽束几何形状中测量扇形初级束。通过应用合适的漂移时间窗口，调整靶体积的有效大小以匹配DNA片段的大小。测量的数据进行了比较与PTB Monte Carlo代码PTra的模拟结果。在比较之前，模拟的团簇尺寸分布相对于电离的目标气体分子的运输系统中产生的额外电离的背景进行校正。粒子轨道结构的测量和模拟特性对于两种类型的初级粒子和两种类型的照射几何形状是非常一致的。
英文摘要：
Ionisation cluster size distributions produced in the sensitive volume of an ion-counting wall-less nanodosimeter by monoenergetic carbon ions with energies between 45 MeV and 150 MeV were measured at the TANDEM-ALPI ion accelerator facility complex of the LNL INFN in Legnaro. Those produced by monoenergetic helium ions with energies between 2 MeV and 20 MeV were measured at the accelerator facilities of PTB and with a 241Am alpha particle source. C3H8 was used as the target gas. The ionisation cluster size distributions were measured in narrow beam geometry with the primary beam passing the target volume at specified distances from its centre, and in broad beam geometry with a fan-like primary beam. By applying a suitable drift time window, the effective size of the target volume was adjusted to match the size of a DNA segment. The measured data were compared with the results of simulations obtained with the PTB Monte Carlo code PTra. Before the comparison, the simulated cluster size distributions were corrected with respect to the background of additional ionisations produced in the transport system of the ionised target gas molecules. Measured and simulated characteristics of the particle track structure are in good agreement for both types of primary particles and for both types of the irradiation geometry.
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