聚丙烯酸酯泡沫密度均匀性的射线检测技术

Detecting technology for density uniformity of trimethylolpropane trimethacrylate polymer foams

低密度泡沫材料大多存在一定程度的密度不均匀性,这对其后续使用性能将带来不良影响。文中简述了ICF靶用聚丙烯酸酯泡沫的制备方法,并利用β射线和X射线检测技术,对直径为mm量级的低密度聚丙烯酸酯泡沫柱进行密度分布表征。研究结果表明:泡沫柱沿轴向的密度分布比较均匀,而沿径向呈内低外高分布,形成了明显的密度梯度。实验表明:射线检测技术测量靶用低密度泡沫的方法可基本满足目前的实验要求,但密度分辨率和空间分辨率还有待进一步提高。

Organic polymer foams have many uses in inertial confinement fusion targets and Z-pinch loads. However, many low density foams are not uniform in some extent, which has bad effects on their performance. Two techniques, the beta radiation technology and X-ray computed tomography（CT） are used for density uniformity characterizing. The data show that the trimethylolpropane trimethacrylate（TMPTA） polymer foams have small density variations： the density is greater at the outer edges than that of the interior of foam. The experiment shows that the measurement of the density distribution in foams can meet the requirement of experiment fundamentally at present, while the spatial resolution and the density resolution need improvement.