Abstract
The Monte Carlo simulation code CEARPPU has been improved to obtain better accuracy for predicting pulse-height spectra measured at high counting rates. Experimental verification was carried out by measuring an Fe-55 spectrum with a Si(Li) X-ray spectrometer. Based on the spectrum measured at low counting rate, which is considered to be the “true” spectrum with no pulse pile-up distortion, the predicted high counting-rate spectrum by CEARPPU is in excellent agreement with the measured one for all of the folded regions due to pulse pile-up. This code is available for public dissemination at Oak Ridge National Laboratory (ORNL) through RSICC. By iteratively using this code, a Monte Carlo approach MCPUT has been proposed and demonstrated for solving the “inverse problem” to make pulse pile-up corrections for pulseheight spectra measured at high counting rates.
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