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Modelling Detector Deadtime with the Pulse Overlap Model

DOI: 10.1063/1.1757960 DOI Help

Authors: David Laundy (Diamond Light Source) , Chiu Tang (Diamond Light Source) , Steve Collins (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: Eighth International Conference on Synchrotron Radiation Instrumentation
Peer Reviewed: No

State: Published (Approved)
Published: August 2004

Abstract: Photon counting detectors have to work at high count rates at synchrotron radiation sources. It is well known that at high count rates, counts may be lost because the time difference between the arrival of two X‐rays in the detector can be too small to resolve each count. This is coventionally modelled in the paralyzable deadtime model. In a previous paper, we introduced a new model — the pulse overlap model. This model predicts that there is a limit to the statistical accuracy that can be achieved by a measurement made in fixed counting time by a given photon counting detector. At counting rates above the point where maximum statistical accuracy is achieved, the statistical accuracy decreases. We present data obtained from computer Monte Carlo simulation and measurements with a real detector and compare with the predictions of the pulse overlap model.

Journal Keywords: Accuracy; Comparative Evaluations; Computerized Simulation; Counting Rates; Forecasting; Monte Carlo Method; Photons; Pulses; Synchrotron Radiation; Synchrotron Radiation Sources; X Radiation; X-Ray Detection

Subject Areas: Physics

Technical Areas: Detectors

Added On: 29/02/2016 11:05

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