Self shielding

Special Self-shielded Irradiation Cells for Fast Neutron Activation of... 

Clayton RN (2002) Self-shielding in the solar nebula. Nature 415 860-861... 

Claypool GE, Holser WT, Kaplan IR, Sakai H, Zak 1 (1980) The age curves of sulfur and oxygen isotopes in marine sulfate and their mutual interpretation. Chem Geol 28 199-260 Clayton RN (1993) Oxygen isotopes in meteorites. Ann Rev Earth Planet Sci 21 115-149 Clayton RN (2002) Self-shielding in the solar nebula. Nature 451 860-861 Clayton RN (2004) Oxygen isotopes in meteorites. In Treatise on geochemistry, vol 1. Elsevier, Amsterdam, pp. 129-142... 

Self-shielding EB processor with the accelerating voltages of 800 kV. (Courtesy of Nissin Electric.)... 

Low-energy self-shielding electron beam processor. (Courtesy of Energy Sciences, Inc.)... 

Gounelle, M., Shu, F. H., Shang, H. et al. (2001) Extinct radioactivities and protosolar cosmic rays self-shielding and light elements. Astrophysical Journal, 548, 1051-1070. 

Self-shielding EB processor with the acceleration voltage... 

Au foils are to be used as flux monitors in a nuclear reactor. What is the maximum thickness that can be used if the self-shielding corrections are to be less than 10% ... 

Since the dissociation of the abundant H2 and CO molecules result from photoabsorption at discrete wavelengths, isotopically selective photodissociation based on self-shielding is possible. Two conditions are required for this (1) dissociation via line absorption for each isotopically substituted molecule, and (2) differential photolysis that depends upon the isotopic abundances. Self-shielding occurs when the spectral lines leading to dissociation of the major isotopic species optically saturate, while the other residual lines relevant for dissociation of the minor isotopes remain transparent. As a consequence, such photolysis depends on nucleic abundance rather than the mass of a molecule see Fig. 4.4 (Langer 1977 Thiemens Heidenreich 1983). 

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