Ochanomizu University, Graduate School of Humanities and Sciences, Bunkyo-ku, Tokyo, Japan.
Health Phys. 2012 Jun;102(6):664-9. doi: 10.1097/HP.0b013e318246471f.
A new wiping device for detecting removable contamination was developed. A cylindrical plastic scintillator (PS) is applied to a roller device. A wiping material wraps around the cylindrical PS roller, and then the roller is used for wiping to detect removable contamination (PS method). After contamination on the floor is wiped off using the roller, the wrapped PS is removed from the roller and placed in a glass vial for use in a liquid scintillation counter (LSC). The vial is measured by LSC without liquid scintillation cocktail. When the PS method was used by wrapping with NUC-Wipe™, the wiping efficiencies, except for the measurement efficiencies, were almost 15% for H and 40% for C. Also a repositionable tape (Double Stick Tape™) could be used for wiping material. The device has three main advantages: 1) Though the wiping efficiency is not very high when using the PS method, the variability observed is lower than that for hand wiping; 2) even when it is contaminated with nuclides whose maximum beta ray energies (Emax) are very close, for example C (Emax; 156 keV) and S (Emax; 167 keV), the contaminated radioisotopes are identified with their spectra by using PS; and 3) the PS method is environmentally friendly, as post-processing time is vastly shortened because it does not use a liquid scintillator. Some issues that were previously considered unavoidable in the wiping method were improved using a plastic scintillator as a roller.
开发了一种用于检测可移除污染物的新型擦拭设备。将圆柱形塑料闪烁体 (PS) 应用于滚轮装置。擦拭材料缠绕在圆柱形 PS 滚轮上，然后使用滚轮进行擦拭以检测可移除污染物（PS 方法）。使用滚轮擦拭掉地板上的污染物后，将包裹的 PS 从滚轮上取下并放入玻璃小瓶中，以便在液体闪烁计数器 (LSC) 中使用。小瓶在不使用液体闪烁鸡尾酒的情况下通过 LSC 进行测量。当使用 NUC-Wipe™进行 PS 方法包裹时，除了测量效率外，H 的擦拭效率几乎为 15%，C 的擦拭效率为 40%。也可以使用可重复定位胶带（Double Stick Tape™）作为擦拭材料。该设备有三个主要优点：1）尽管使用 PS 方法时擦拭效率不是很高，但观察到的可变性低于手动擦拭；2）即使被最大 β 射线能量 (Emax) 非常接近的核素污染，例如 C (Emax; 156 keV) 和 S (Emax; 167 keV)，也可以通过 PS 识别其光谱中的放射性同位素；3）PS 方法对环境友好，因为后处理时间大大缩短，因为它不使用液体闪烁剂。使用塑料闪烁体作为滚轮，可以改进以前认为在擦拭方法中不可避免的一些问题。
