丙烯酸净化和涂料
Acrylic purification and coatings
摘要：
氡（Rn）及其衰变子体是直接WIMP探测实验中众所周知的背景源，因为从探测器的薄内表面层发射的Rn衰变子体或α粒子可以产生类似WIMP的信号。过去已采用不同的表面处理和清洁技术来去除这种类型的污染。提出了一种新的处理方法，并用于丙烯酸DEAP-1探测器原型。探测器的内表面涂有一层超纯丙烯酸，旨在保护有效体积免受α粒子和反冲核的影响。介绍了一种丙烯酸纯化技术和两种涂层技术：溶剂型（在DEAP-1上测试）和无溶剂型（正在为全尺寸DEAP-3600检测器开发）。
英文摘要：
Radon (Rn) and its decay daughters are a well-known source of background in direct WIMP detection experiments, as either a Rn decay daughter or an alpha particle emitted from a thin inner surface layer of a detector could produce a WIMP-like signal. Different surface treatment and cleaning techniques have been employed in the past to remove this type of contamination. A new method of dealing with the problem has been proposed and used for a prototype acrylic DEAP-1 detector. Inner surfaces of the detector were coated with a layer of ultra pure acrylic, meant to shield the active volume from alphas and recoiling nuclei. An acrylic purification technique and two coating techniques are described: a solvent-borne (tested on DEAP-1) and solvent-less (being developed for the full scale DEAP-3600 detector).
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