Schwob L, Koumeir C, Servagent N, Cherel M, Guertin A, Haddad F, Métivier V, Michel N, Poirier F, Rahmani A, Varmenot N
GIP ARRONAX, Saint Herblain, France.
GIP ARRONAX, Saint Herblain, France SUBATECH, Ecole des Mines de Nantes, CNRS/IN2P3, Université de Nantes, Nantes
Radiat Prot Dosimetry. 2015 Sep;166(1-4):257-60. doi: 10.1093/rpd/ncv199. Epub 2015 Apr 20.
The ARRONAX cyclotron is able to deliver alpha particles at 68 MeV. In the frame of radiological research, a new method is studied to infer in situ the deposited dose: it is based on the online measurement of the bremsstrahlung (>1 keV) produced by the interaction of the incident particle with the medium. Experiments are made using bombarded poly(methyl methacrylate) (PMMA)-equivalent water targets in order to characterise this continuous X-ray spectrum. The intensity of the bremsstrahlung spectrum allows for the beam monitoring. A simulation code of the bremsstrahlung has been built, and a good agreement is found with the experimental spectra. With this simulation, it is possible to predict the sensibility of this method: it varies with the target thickness, showing a good sensibility for thin target (<1000 µm) and saturation for thicker ones. Bremsstrahlung spectrum also shows a sensibility on the target's chemical composition.
阿罗纳克斯回旋加速器能够提供能量为68兆电子伏特的α粒子。在放射学研究框架内，正在研究一种新方法来原位推断沉积剂量：该方法基于对入射粒子与介质相互作用产生的轫致辐射（>1keV）进行在线测量。使用被轰击的聚甲基丙烯酸甲酯（PMMA）等效水靶进行实验，以表征这种连续X射线谱。轫致辐射谱的强度可用于束流监测。已经建立了轫致辐射的模拟代码，并且发现与实验谱有良好的一致性。通过这种模拟，可以预测该方法的灵敏度：它随靶厚度而变化，对于薄靶（<1000μm）显示出良好的灵敏度，而对于较厚的靶则达到饱和。轫致辐射谱对靶的化学成分也有灵敏度。
