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bobred

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I have some data from a gamma spectroscopy lab and using a series of known radioactive sources I obtain a calibration curve. The equipment is a scintillation crystal coupled to a photo-multiplier tube connected to a multi-channel analyser to obtain an energy spectrum. Using Excel I add a linear trend line of the form y=mx+c, adding a polynomial of increasing order the equation gives the energy more precisely. Is using a polynomial trend line appropriate or should I be using a linear trend line?