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Peak summing
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Peak summing occurs under close geometry conditions and is a result of true coincidence summing. To identify these peaks, add the main peak (highest intensity) to the next most intense peak energy and look to see if such a peak exists in the spectrum; if this peak does not occur then try the next most intense peak, and so on.

Summation effects are caused by the coincident detection of two or more gamma ray photons.

Peak summing image

 

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1999, 2000 The University of Liverpool, Department of Physics

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