• Organization: National Institute of Standards and Technology
• Dataset Last Updated: January 01, 2014

This database is the product of a multi-year, comprehensive evaluation and expansion of the world's most widely used mass spectral reference library.

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• Organization: National Institute of Standards and Technology
• Dataset Last Updated: July 01, 2004

Tables of X-Ray Mass Attenuation Coefficients and Mass Energy - Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest include...

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• Organization: National Institute of Standards and Technology
• Dataset Last Updated: January 01, 2014

This site, developed in the Physics Laboratory at NIST, addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and...

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