EGS4 calculations for a Cd-Zn-Te detector to measure synchrotron radiation at PEP-II

Nelson, W.R.; Borak, Thomas B.; Malchow, R.; Toki, W. H.; Kadyk, J. A.

doi:10.2172/663292

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With this configuration, detector responses are simulated for all possible detector positions around the circumference of the pipe. The detectors are not described in detail here but when a simulated photon arrives at a particular detector its further progress is followed by reference to a representative 'pseudo-detector' sketched in figure 3 [5]. This simplifies the model considerably.…”

Section: The Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Untitled

Åbro

Khoryakov

Johansen

et al. 1999

Meas. Sci. Technol.

View full text Add to dashboard Cite

This paper describes low-energy gamma-ray densitometry using a 241Am source for the determination of void fraction and flow regime in oil/gas pipes. Due to the reduced shielding requirements of this method compared to traditional gamma-ray densitometers using 137Cs sources, the low-energy source offers a compact design and the advantage of multi-beam configuration. One of the aims of this investigation was to demonstrate the use of a neural network to convert multi-beam gamma-ray spectra into a classification of the flow regime and void fraction, as well as to determine which detector positions best serve this purpose. In addition to spectra obtained from measurements on a set of phantom arrangements, simulated gamma-ray spectra were used. Simulations were performed using the EGS4 software package. Detector responses were simulated for void fractions covering the range from 0 - 100%, and the simulations were performed with homogeneous, annular and stratified flows. Neural networks were trained on the simulated gamma-ray data and then used to analyse the measured spectra. This analysis allowed determination of the void fraction with an error of 3% for all of the flow regimes, and the three types of flow regime were always correctly distinguished. It has thus been shown that multi-beam gamma-ray densitometers with detector responses examined by neural networks can analyse a two-phase flow with high accuracy.

show abstract

Section: The Modelsmentioning

confidence: 99%

“…Figure 2 shows the model of homogeneous flow, including region numbers and the pseudo-detector. Details of the pseudo-detector are shown in figure 3 [5]. Three cylinders and five planes define the BNC connector with the CZT detector included.…”

Section: The Modelsmentioning

confidence: 99%

Untitled

Åbro

Khoryakov

Johansen

et al. 1999

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In a previous study [1], the EGS4 Code System [2] was used to calculate the spectral response for a CdZnTe detector (called CZT hereafter) that was used to measure the synchrotron radiation leakage spectra in a PEP-II accelerator radiation environment. In that paper, minor disagreements were found when the EGS4-calculated photon spectra were compared with measurements made using encapsulated 241 Am, 133 Ba and 109 Cd disk sources.…”

Section: Introductionmentioning

confidence: 99%

Response Calculations of the CdZnTe Detector Using EGS4

Liu¹

2000

View full text Add to dashboard Cite

The spectral response of a CdZnTe semiconductor detector has been calculated with the EGS4 Code System. The latest low-energy photon production and transport routines developed at KEK, which consider the K and L shell fluorescent photon production in compounds, bound Compton scattering, Doppler broadening, etc., were included in the EGS4 code. The calculations of the CdZnTe detector also took into account the collection efficiency of the produced electron-hole pairs (described by Hecht equation) and the modification on spectral peaks due to both the Fano factor and electronic-noise broadening. The calculated results are compared with measurements made with encapsulated 241 Am and 137 Cs disk sources. It was found that, by trying various mobility-lifetime values for holes, the calculated spectral response still did not have perfect agreement with measurements.

show abstract