Essien I O, Sandoval D N, Kuroda P K
Health Phys. 1985 Mar;48(3):325-31. doi: 10.1097/00004032-198503000-00010.
The concentration of 238U in rain and snow collected at Fayetteville (36 degrees N, 94 degrees W), AR, showed a marked increase during the summer months of 1980; and also during spring 1981, while Mount St. Helens remained active. This observed increase of 238U was due to the fallout of natural U from the eruption of Mount St. Helens. Based on the results from the analysis of rain and snow samples for the period March 1980-October 1982, the amount of 238U brought down by the rain is estimated to be 6.55 X 10(3) Ci.
在阿肯色州费耶特维尔（北纬36度，西经94度）收集的雨雪中，238U的浓度在1980年夏季显著增加；在1981年春季圣海伦斯火山仍处于活跃状态时也出现了增加。观测到的238U增加是由于圣海伦斯火山喷发产生的天然铀沉降所致。根据1980年3月至1982年10月期间雨雪样本的分析结果，估计降雨带来的238U量为6.55×10(3)居里。
