背景沙漠气溶胶浓度的日变化主要由大气扩散稀释能力控制。
The diurnal variation of concentration of background desert aerosol is mainly controlled by air disperse dilution.
碘131进入空气后能被大量稀释，但是如果碘扩散到草地，草又被母牛吃掉，母牛会将碘的含量凝聚到1000倍。
Levels of iodine 131 entering the air can be very diluted, but if the iodine is deposited on grass eaten by cows, the cows will reconcentrate it in their milk by a factor of 1,000.
碘131进入空气后能被大量稀释，但是如果碘扩散到草地，草又被母牛吃掉，母牛会将碘的含量凝聚到1000倍。
Levels of iodine 131 entering the air can be very diluted, but if the iodine is deposited on grass eaten by cows, the cows will reconcentrate it in their milk by a factor of 1, 000.
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