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X-ray energies increase with atomic number, Z. X-rays originate from photon emissions as electrons drop back into the K and L shells of atoms. Thus they have characteristic wavelengths.
Hydrogen has the lowest energy X-rays (Ek=13.6 eV) which is the first ionzation potential. It has one electron in the K-shell.
The highest energy is about 142 keV, which corresponds to Z=100 (Fermium).
See the following resources:
http://www.wsu.edu/~collins/Phys415/writeups/Moseley.htm
http://dental.senzoku.showa-u.ac.jp/dent/radiol/Prometheus/Storm&Israel_1970/S&I_Tables_II-VIII/S&I_Table_III.html
http://online.nucleartraining.co.uk/resources/xrayenergies.htm
http://online.nucleartraining.co.uk/resources/index.htm (more resources, links to downloads and other sites)
Gamma-rays originate from the nucleus of atoms upon the absorption of a neutron (n, [itex]\gamma[/itex]) reaction, in decay of many radionuclides following beta decay, and from the decay of some subatomic particles.
The lowest energy gamma (from Er-169) has an energy of 8 kev (0.008 MeV). About 58 radionuclides have gamma-energies in the X-ray region (8-145 keV).
For some information on gamma-rays (sources, energies, yields) of selected radionuclides - see http://ie.lbl.gov/toipdf/eandi.pdf
Gamma-rays from neutron capture.
Tables of http://www-nds.iaea.org/wallet/tnc/ngtblcontentbyn.shtml
Tables of http://www-nds.iaea.org/wallet/tnc/ngtblcontentbye.shtml
Hydrogen has the lowest energy X-rays (Ek=13.6 eV) which is the first ionzation potential. It has one electron in the K-shell.
The highest energy is about 142 keV, which corresponds to Z=100 (Fermium).
See the following resources:
http://www.wsu.edu/~collins/Phys415/writeups/Moseley.htm
http://dental.senzoku.showa-u.ac.jp/dent/radiol/Prometheus/Storm&Israel_1970/S&I_Tables_II-VIII/S&I_Table_III.html
http://online.nucleartraining.co.uk/resources/xrayenergies.htm
http://online.nucleartraining.co.uk/resources/index.htm (more resources, links to downloads and other sites)
Gamma-rays originate from the nucleus of atoms upon the absorption of a neutron (n, [itex]\gamma[/itex]) reaction, in decay of many radionuclides following beta decay, and from the decay of some subatomic particles.
The lowest energy gamma (from Er-169) has an energy of 8 kev (0.008 MeV). About 58 radionuclides have gamma-energies in the X-ray region (8-145 keV).
For some information on gamma-rays (sources, energies, yields) of selected radionuclides - see http://ie.lbl.gov/toipdf/eandi.pdf
Gamma-rays from neutron capture.
Tables of http://www-nds.iaea.org/wallet/tnc/ngtblcontentbyn.shtml
Tables of http://www-nds.iaea.org/wallet/tnc/ngtblcontentbye.shtml
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