Why are there peaks on the photon spectrum, shouldn't they be smooth curves？ #769
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6MV electrons beam, source NO.0 with a W700ICRU target. They occur no matter how I change the target size.
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These peaks are x-rays emitted when electrons relax between inner shells. Their positions depend on the element, hence they are called "characteristic" x-rays. The smooth background curve is from bremsstrahlung emission. See any textbook on x-rays, or for a brief summary: http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/xrayc.html. |
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Thanks, I see. But I didn't expect it to be such a big part compared with other papers. What made the difference? |
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I don't know; what IS the difference in the models? Difficult to comment without more information; for example, the W target is supported by some other material, there may be filtration, etc. But the spectra for pure W unequivocally has a significant K peak around 58 keV (see https://xdb.lbl.gov/Section1/Periodic_Table/W_Web_data.htm). You can find many references for this, e.g.,
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These peaks are x-rays emitted when electrons relax between inner shells. Their positions depend on the element, hence they are called "characteristic" x-rays. The smooth background curve is from bremsstrahlung emission. See any textbook on x-rays, or for a brief summary: http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/xrayc.html.