periodictable is a software that provides a periodic table of the elements with support for mass, density and xray/neutron scattering information.
Masses, densities and natural abundances come from the NIST Physics Laboratory, but do not represent a critical evaluation by NIST scientists.
Neutron scattering calculations use values collected by the Atomic Institute of the Austrian Universities. These values do corresponding to those from other packages, though there are some differences depending to the tables used. Bound coherent neutron scattering for gold in particular is significantly different from older value: 7.63(6) as measured in 1974 compared to 7.90(7) as measured in 1990.
X-ray scattering calculations use a combination of empirical and theoretical values from the LBL Center for X-ray Optics. These values differ from those given in other sources such as the International Tables for Crystallography, Volume C, and so may give different results from other packages.
What's New in This Release: [ read full changelog ]
· add activation decay time to neutron activation calculator
· Change neutron scattering calculations for incoherent cross section to be the linear combination of the incoherent cross sections of the individual atoms rather than total cross section minus the coherent cross section. Penetration depth of the unscattered beam still uses the total cross section plus the absorption cross section.