for instance,i broke using tensile mechine steel sample A first, and i did not do any preparation,i.e coating, before place it into SEM,the result of its composition comes out by EDAX on carbon is 2.74% comparing to theoretical value 0.1%...basicly same things happened to copper and aluminum...
i was using the normal type of steel,which contains normally 0.1%carbon in itself. and the same situation happened in other materials which should not have any carbon inside, like aluminum,copper.
when i was using Scanning Electron Microscope to investigate fracture surface of a metal sample,the results of composition of it appeared so different to what the composition should be, that sample contains 2% carbon comparing to normally 0.1%. i thought there are 3 ways of doing that...
i am going to write a report about photon scattering, and i still do not familiar about the concept of how many embranchment of it i have to write about, if anyone can tell me any information about it that could be great help to me,then i appreciate to the people who help me here!