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Query: EC:2.7.11.8 (
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)
758
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
High-precision measurement of X-ray spectra is affected by the statistical fluctuation of the X-ray beam under low-counting-rate conditions. It is also limited by counting loss resulting from the dead-time of the system and pile-up pulse effects, especially in a high-counting-rate environment. In this paper a detection system based on a
FAST
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SDD
detector and a new kind of unit impulse pulse-shaping method is presented, for counting-loss correction in X-ray spectroscopy. The unit impulse pulse-shaping method is evolved by inverse deviation of the pulse from a reset-type preamplifier and a C-R shaper. It is applied to obtain the true incoming rate of the system based on a general fast-slow channel processing model. The pulses in the fast channel are shaped to unit impulse pulse shape which possesses small width and no undershoot. The counting rate in the fast channel is corrected by evaluating the dead-time of the fast channel before it is used to correct the counting loss in the slow channel.
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PMID:Counting-loss correction for X-ray spectroscopy using unit impulse pulse shaping. 2948 30
The CR-(RC)
n
filter is used for Semi-Gaussian pulse shaping in analog spectroscopy. A new digital CR-(RC)
n
filter is presented based on the recursive models of the CR filter and RC filter. The spectroscopic signal reconstruction technique is proposed. This technique is applied to digital exponential decay signals obtained by the digitization of analog signals that represent the combined response of a
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detector and the associated front-end circuit. Compared with the direct application of the digital CR-(RC)
n
filter, the technique eliminates the undershoot of the Semi-Gaussian pulse which is the primary cause of the low-energy peak tailing. And, the digital pole-zero cancellation filter follows digital CR-(RC)
n
filter to reduce the long tail of the shaped Semi-Gaussian pulse which leads to the high-energy peak tailing. Experimental results based on XRF signals of manganese sample show that the proposed techniques can cancel peak tailing due to the shaped Semi-Gaussian pulse improving FWTM/FWHM ratio and throughput capability.
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PMID:Peak tailing cancellation techniques for digital CR-(RC)
n
filter. 3306 86
