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The NADP monitors precipitation chemistry from numerous sites around the United States. The NADP consists of 5 networks: National Trends Network, Mercury Deposition Network, Atmospheric Integrated Research Monitoring Network, Atmospheric Mercury Network, and Ammonia Monitoring Network. Data is provided by each network.
The primary interaction of low-energy x rays within matter, viz. photoabsorption and coherent scattering, have been described for photon energies outside the absorption threshold regions. These tables are based on a compilation of the available experimental measurements and theoretical calculations. For many elements there is little or no published data and in such cases it was necessary to rely on theoretical calculations and interpolations across Z. In order to improve the accuracy in the future considerably more experimental measurements are needed.