A comprehensive comparison of CEPXS/ONELD calculations of dose enhancement with the Co-60 data set of Wall and Burke

Garth, J.C.; Critchfield, K.L.; Turinetti, J.R.; Beutler, D.E.

doi:10.1109/23.556860

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Second, only one dimensional transport is required for the filtered spectrum analysis of device testing. Third, CEPXS/ONELD has been shown to handle very well the dose enhancement that may occur in many devices [9], as compared to other photon-only discrete ordinates codes. The response function of the detector was applied to the measured pulse-height distribution to give a corrected spectnun at 20,50, and 80 keV.…”

Section: ) Computer Codementioning

confidence: 99%

Determination of low energy (<160 keV) X-ray spectra and verification of transport calculations through silicon

Turinetti

Critchfield

Chavez

et al. 1997

IEEE Trans. Nucl. Sci.

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X-ray spectroscopy discrepancies at measured energies below 50 keV are shown through ITS detector response calculations to be caused by germanium K edge escape peak losses. Accounting for this detector response, CEPXS/ONELD transport calculations through silicon agree well with measurements. 'Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the U.S. Department of Energy under Contract DE-AC04-94AL85000.

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Section: ) Computer Codementioning

confidence: 99%

Determination of low energy (<160 keV) X-ray spectra and verification of transport calculations through silicon

Turinetti

Critchfield

Chavez

et al. 1997

IEEE Trans. Nucl. Sci.

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Toward a multi‐layer micro‐structured detector for high‐energy electron radiotherapy

Brivio,

Liles,

Gagne

et al. 2024

Medical Physics

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BackgroundThe use of electron beams has been rekindled by the advent of ultra‐high‐dose rate radiotherapy (FLASH) and very high energy electrons (VHEE). The need for development of novel technology for beam monitoring and dosimetry of such beams is of paramount importance prior to their clinical translation.PurposeIn this work we explore the potential of a multi‐layer nanoporous aerogel High‐Energy‐Current (HEC) detector as a dosimeter for electron beam. The detector does not suffer from radiation damage or signal saturation, making it suitable for very‐high‐dose‐rate applications. Standard dose rates and energies are used to establish reference for FLASH and VHEE. We explore detector response to electron energy and residual range both experimentally and computationally.MethodsMultilayer HEC detectors were constructed using 1×–10× basic modules of Aluminum(Al)_aerogel(A)_Tantalum(Ta) with 10–70 µm layer thicknesses. Signals are collected from all electrodes (3–21, depending on module multiplicity) with zero external voltage bias. Measurements are acquired as a function of depth(z) in water equivalent plastic using Varian TrueBeam for energies E = 6,9,12,15 MeV (SAD = 105 cm, 6 × 6 cone, 1000 MU/min). Computational simulations of identical detector geometries are performed using the 1D deterministic code CEPXS/ONEDANT. Additionally, percent‐depth‐doses PDD(z), measured with diode in water, are used to explore the response of HEC for various energies and residual ranges.ResultsThe current measured from Ta electrodes resembles the shape of deposited charges in water and it is proportional to the derivative of the clinical PDD corrected for contribution from photon contamination. The signal is positive on the surface, and it decreases with depth reaching a negative local minimum at z = R50, before increasing again, reaching zero at about the practical range z = Rp. In contrast, the signal from Al electrodes is shaped like the electron PDD(z) shape but with lower signal at the surface and higher bremsstrahlung tail. By subtracting the signal from Ta and Al electrodes we obtained a curve resembling PDD(z,E) after Bremsstrahlung contamination correction.ConclusionsMulti‐layer HEC sensors exhibit characteristic responses to electron beams that are unlike responses of ion chambers or diodes. Since the sensor structures are sensitive to electronic disequilibrium, high‐Z electrodes give a signal proportional to the charge deposition pattern and can be modeled using the derivative of PDD(z).

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A review of the 40-year history of the NSREC'S dosimetry and facilities session (1963-2003)

Beezhold

Beutler

Garth

et al. 2003

IEEE Trans. Nucl. Sci.

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A comprehensive comparison of CEPXS/ONELD calculations of dose enhancement with the Co-60 data set of Wall and Burke

Abstract: CECPXS/ONELD code predictions of dose enhancement in a 1-D geometry were examined. Relative dose calculations at CO-60 energes were compared with ionization chamber data of Wall and Burke for 54 different cases. Excellent agreement was found.

Cited by 4 publications

References 11 publications

Determination of low energy (<160 keV) X-ray spectra and verification of transport calculations through silicon

Determination of low energy (<160 keV) X-ray spectra and verification of transport calculations through silicon

Toward a multi‐layer micro‐structured detector for high‐energy electron radiotherapy

A review of the 40-year history of the NSREC'S dosimetry and facilities session (1963-2003)

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