Improvements of low-energy photon transport in EGS4

Namito, Yoshihito; Hirayama, Hideo; Ban, Syuichi

doi:10.1016/s0969-806x(98)00110-8

Cited by 36 publications

(22 citation statements)

References 36 publications

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“…To benchmark the EGS4 results, field experiments were conducted to determine stationary and scanning FIDLER detection efficiencies. EGS4 simulations were executed using the bound Compton cross section improvements (Namito et al 1998).…”

Section: Methodsmentioning

confidence: 99%

Signal Processing and Its Effect on Scanning Efficiencies for a Field Instrument for Detecting Low-energy Radiation

Marianno¹

2015

Health Physics

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Signal processing within a radiation detector affects detection efficiency. Currently, organizations such as private industry, the U.S. Navy, Army, and Air Force are coupling some detector systems with data collection devices to survey large land areas for radioactive contamination. As detector technology has advanced and analog data collection has turned to digital, signal processing is becoming prevalent in some instruments. Using a NIST traceable (241)Am source, detection efficiency for a field instrument for detecting low-energy radiation (FIDLER) was examined for both a static and scanning mode. Experimental results were compared to Monte Carlo-generated efficiencies. Stationary data compared nicely to the theoretical results. Conversely, scanning detection efficiencies were considerably different from their theoretical counterparts. As speed increased, differences in detection efficiency approached two orders of magnitude. To account for these differences, a quasi time-dependent Monte Carlo simulation was created mimicking the signal processing undertaken by the FIDLER detection system. By including signal processing, experimental results fell within the bounds of the Monte Carlo-generated efficiencies, thus demonstrating the negative effects of such processing on detection efficiencies.

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Section: Methodsmentioning

confidence: 99%

Signal Processing and Its Effect on Scanning Efficiencies for a Field Instrument for Detecting Low-energy Radiation

Marianno¹

2015

Health Physics

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“…The scattering foil was placed in a vacuum chamber, and vacuum pipes were placed between the vacuum chamber and our detector to avoid any air scattering. 9,10) After passing through the second stainless steel collimator, the photons were detected by a Schottky CdTe detector. The distance from the surface of the carbon foil to the exit of the second collimator was 424 mm and the aperture diameter was 5.01 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

Measurement and Calculation of Compton Spectrometer Response Function for 10–60-keV Monoenergetic Photons

Mohammadi

Baba

Oishi

et al. 2010

J. Nucl. Sci. Technol.

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The accuracy and suitability of two Monte Carlo codes for the simulation of a Compton spectrometer response function were studied. The Compton-scattered photon spectra were measured with a Schottky CdTe detector for 10-60-keV monoenergetic primary beams, and compared with the calculations, using EGS5 and MCNP4C codes. The results confirmed the accuracy of the simulations; however, the accuracy of EGS5 was significantly higher due to its ability to simulate the Doppler broadening effect.

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“…The other region is the energy range 10-20 keV, which can be now partially explained by bremsstrahlung. According to Namito et al, [9] this region can host pulse pile-up. Because the effective number of counts of the measurement and information on the acquisition electronics are not available, it is not possible to apply the pulse pile-up correction to the measured spectrum.…”

Section: Bremsstrahlung Contribution For An Arbitrary Energymentioning

confidence: 96%

“…Simulation of a Cu specimen, using as source a synchrotron beam at 40 keV. The experimental set-up is described by Namito et al [9] The figure shows the comparison between the complete PENELOPE simulation and the first-order intensity of bremsstrahlung computed using the data library. It is apparent the excellent agreement in the description of the continuous bremsstrahlung background.…”

Section: Bremsstrahlung Contribution For An Arbitrary Energymentioning

confidence: 99%

“…Comparison between the experimental data from Namito et al [9] with (a) the simulation of the transport in the target performed with the code MCSHAPE with and without bremsstrahlung; (b) the simulation with MCSHAPE including bremsstrahlung and the detector response computed with MCSHAPE; and (c) the simulation of MCSHAPE including bremsstrahlung, the detector response computed with MCSHAPE, and the effects of resolution…”

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confidence: 99%

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Bremsstrahlung contribution to the X‐ray spectrum in coupled photon–electron transport

et al. 2015

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Secondary electrons produced by Compton scattering and photoelectric effect contribute to the photon field through conversion mechanisms like bremsstrahlung and inner-shell impact ionization (ISII). Because electrons interact continuously, the solution of the coupled transport problem is complex and time consuming. For this reason, photon transport codes frequently neglect the effects due to secondary electrons. Both of these contributions have been computed by means of the ad hoc code KERNEL that uses the Monte Carlo code PENELOPE specific for coupled transport. The correction on the intensity of the characteristic lines due to ISII was treated in a recent paper of our group. This paper adds the continuous contribution to the radiation field due to bremsstrahlung by secondary electrons. The bremsstrahlung emission is studied in terms of angle, space, and energy. The continuous contribution is stored in a data library for selected photon source energies in the interval 1-150 keV and for all the elements Z = 1-92. For intermediate source energies, the single element contribution is obtained by interpolating the data library. An example is presented on how to use the data library to include bremsstrahlung in the simulation of a synchrotron experiment.

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Improvements of low-energy photon transport in EGS4

Cited by 36 publications

References 36 publications

Signal Processing and Its Effect on Scanning Efficiencies for a Field Instrument for Detecting Low-energy Radiation

Signal Processing and Its Effect on Scanning Efficiencies for a Field Instrument for Detecting Low-energy Radiation

Measurement and Calculation of Compton Spectrometer Response Function for 10–60-keV Monoenergetic Photons

Bremsstrahlung contribution to the X‐ray spectrum in coupled photon–electron transport

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