0
answers
0
watching
55
views
23 Nov 2019
It is an experimental observation that during electron irradiation of a material below a given electron energy no displacements are possible. Occasionally it is possible to observe damage even below Ed as a result of secondary displacements through light element impurities. If bcc Fe has a displacement energy of 40 eV and contains C. What purity Fe would be necessary to ensure that secondary displacements are limited to 1/100 of the primary displacements at an electron energy of 900 keV? The displacement cross-section for 900 keV electrons is 30 b in Fe and 20 b in C. IF needed, consider Ed for C to be 25 eV.
It is an experimental observation that during electron irradiation of a material below a given electron energy no displacements are possible. Occasionally it is possible to observe damage even below Ed as a result of secondary displacements through light element impurities. If bcc Fe has a displacement energy of 40 eV and contains C. What purity Fe would be necessary to ensure that secondary displacements are limited to 1/100 of the primary displacements at an electron energy of 900 keV? The displacement cross-section for 900 keV electrons is 30 b in Fe and 20 b in C. IF needed, consider Ed for C to be 25 eV.
