Frey G, Hopke P K, Stukel J J
Science. 1981 Jan 30;211(4481):480-1. doi: 10.1126/science.211.4481.480.
The two-filter method described by Thomas and LeClare was used to investigate the effects of trace concentrations of nitric oxide and nitrogen dioxide in dry nitrogen on the diffusion coefficient of radium A (polonium-218). Charged radium A was neutralized in 10 parts per million (ppm) nitrogen dioxide in dry nitrogen, in 8.3 ppm nitric oxide in dry 92 percent nitrogen and 8 percent oxygen, and in nitrogen with 20 and 80 percent relative humidity. No neutralization was seen in dry nitrogen, dry oxygen, dry air, or 10 ppm nitric oxide in dry nitrogen. The diffusion coefficient of the neutral radium A species was found to be 0.079 square centimeters per second, regardless of the relative humidity of the nitrogen gas atmosphere. Lower values were observed for charged species.
托马斯和勒克莱尔所描述的双滤器方法被用于研究干燥氮气中痕量一氧化氮和二氧化氮对镭A（钋-218）扩散系数的影响。带电的镭A在百万分之十（ppm）的干燥氮气中的二氧化氮、干燥的92%氮气和8%氧气中百万分之8.3的一氧化氮以及相对湿度为20%和80%的氮气中被中和。在干燥氮气、干燥氧气、干燥空气中或干燥氮气中百万分之10的一氧化氮中未观察到中和现象。无论氮气气氛的相对湿度如何，中性镭A物种的扩散系数均为每秒0.079平方厘米。带电物种的扩散系数值较低。
