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    • 4. 发明申请
    • Accelerated ultralow moisture permeation measurement
    • 加速超低湿度渗透测量
    • US20060236755A1
    • 2006-10-26
    • US11114814
    • 2005-04-25
    • Roko BujasRalf DunkelWilliam Raggio
    • Roko BujasRalf DunkelWilliam Raggio
    • G01N15/08
    • G01N15/0826G01N15/0806G01N2015/086G01T1/185
    • By measuring ultralow moisture permeation through a barrier material sample at a temperature substantially above ambient, definitive values are produced on an accelerated basis that can be used to accurately predict long term daily performance of that barrier material. The sample is heated to a desired test temperature where there is controlled access to both its upstream and downstream surfaces, and HTO vapor is then supplied at predetermined relative humidity to the upstream surface by fracturing a glass ampoule containing not more than 10 millicuries of specific radioactivity for each test. Radioactive gas permeating from the downstream surface is collected by circulating a very slow flow of dry carrier gas past the downstream surface, which stream flows to an ionization chamber containing a beta-particle radiation monitor. Continuous monitoring generates signals that are converted to calculate instantaneous permeation rates through the sample, and operation at such elevated temperature is carried out until the values being monitored reach a steady state, allowing accurate prediction of the extent of long term barrier protection against moisture permeation the sample will exhibit.
    • 通过在基本上高于环境温度的温度下测量通过阻挡材料样品的超低水分渗透,可以加速地产生可用于准确预测该阻隔材料的长期日常性能的确定值。 将样品加热到所需的测试温度,在那里可控制地进入其上游和下游表面,然后通过压裂含有不超过10毫升特定放射性的玻璃安瓿来将HTO蒸气以预定的相对湿度供应到上游表面 为每次测试。 通过将非常缓慢的干燥载气流经过下游表面循环而收集从下游表面渗透的放射性气体,该流将流入含有β粒子辐射监测器的电离室。 连续监测产生的信号被转换成计算通过样品的瞬时渗透速率,并且在这样升高的温度下进行操作,直到监测值达到稳定状态,允许准确预测长期屏障防止水分渗透的程度 样品将展出。