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选择一种适合的材料作为氡的屏障,不仅能降低氧气体的扩散,并能区别气体中不同的同位素。为此目的,测试了几种有机材料和膜。测定的某种物质或膜的适用性参数是渗透性常数。本文介绍了某些塑料膜对氡渗透性常数的测定技术。渗透性常数的测定基本上包括测量在稳定状态条件下氡穿过研究膜的浓度比。实验由氡源和被研究的膜分开的氡检测器组成。本实验使用的氨源是装在7.6升容量容器里的含有比镭含量为1730微微居里/克粉末状铀矿石。巳知该矿石没有钍-232。采用的氡探测器是标准的闪烁瓶。试验所用的材料是市售的天然胶膜:聚酯薄膜(Mylar)、PVC、硝酸纤维素聚脂和聚碳膜。闪烁瓶与带有聚氨酯(Polyurethane)薄膜的含源容器连接。闪烁瓶连接光电倍增管,计数记录装置连续不断地计数和记录闪烁瓶内α衰变的结果,计数连续进行,直到探测器瓶中的计数稳定为止。记录
Choosing a suitable material as a barrier to radon can not only reduce the diffusion of oxygen but also distinguish different isotopes in the gas. For this purpose, several organic materials and films were tested. A material or membrane suitability parameter measured is a permeability constant. This article describes the determination of certain plastic film radon permeability constant. The determination of the permeability constant essentially consists of measuring the concentration ratio of radon passing through the membrane under steady-state conditions. The experiment consisted of a radon detector separate from the radon source and the membrane studied. The ammonia source used in this experiment was a powder containing 1730 pico-curie / gram of uranium ore contained in a 7.6 liter capacity vessel. It is known that there is no thorium-232 in the ore. The radon detector used is a standard scintillation vial. The materials used in the experiment were commercially available natural plastic films: Mylar, PVC, nitrocellulose polyester and polycarbon film. The scintillation vial is connected to a source containing container with a polyurethane film. The scintillation vial connects to the photomultiplier tube, and the counting and recording device continuously counts and records the result of alpha decay in the scintillation vial. The counting is continued until the counts in the vial are stable. recording