Characteristic X-rays induced by electrons and positrons from β-emitting radioisotopes

Chesta, M. A.; Plivelic, Tomás S.; Mainardi, Raúl T.

doi:10.1016/s0168-583x(98)00577-1

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…This secondary radiation is mainly produced during the slowing down of secondary or ternary particles (i.e. electrons, positrons and delta rays) and its intensity might be great in certain conditions [25][26].…”

Section: Methodsmentioning

confidence: 99%

Kerma and Photons Absorbed-Dose from Ir-192 HDR Seeds

Chesta

Poma

Donnell³

2014

EJB

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Precise calculations of absorbed dose (AD) are a difficult task involving physical phenomena such as emission, transport, and absorption of radiation. We used the Monte Carlo method to calculate Kerma as well as AD in water imparted by two different Ir-192 HDR brachytherapy seeds (Flexisource and microSelectron-v2) taking into account the AAPM TG-43 formalism and AAPM & ESTRO most recent reports recommendations. The aim of this work is to evaluate when can Kerma be used as a measurement of AD for this type of seeds. Thus, we analyse the behaviour of both quantities in whole space, putting special emphasis near the source surface. We carried out calculations using microvoxels to obtain high spatial resolution of data close to the source. We observed differences of up to 6 % between AD and Kerma within 1 mm around the seed, and less than 1 % in any other region of the phantom. This allows us to analyse build-up region for Ir-192 HDR brachytherapy seeds. As it will be further discussed in this paper, our results can be explained in terms of partial electronic equilibrium reached on different regions of the phantom. Both seeds showed common overall behaviour, providing generality to the conclusions drawn. The complete bearing of the radial dose function (defined in the TG43 formalism) as it traverses the surface of the seed is reported. Whenever comparisons are possible, our results are in agreement with those reported by other authors. Tables of radial dose function, including new data computed from AD rate (instead of Kerma rate), are presented.

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Section: Methodsmentioning

confidence: 99%

Kerma and Photons Absorbed-Dose from Ir-192 HDR Seeds

Chesta

Poma

Donnell³

2014

EJB

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“…The possibility of creating a high ef®ciency tuneable source of quasi-monochromatic X-rays was considered. Chesta et al 30 reported a comparison of the ef®ciency of energetic electrons and positrons from low intensity 90 Sr and 22 Na radioactive sources to produce characteristic radiation. A new experimental con®guration for radioisotope excited XRF analysis offering at least a ten-fold increase in intensity of X-rays emitted by the sample when compared with a conventional radioactive source was claimed.…”

Section: General Instrumentation and Excitation Sourcesmentioning

confidence: 99%

X-ray fluorescence spectrometry

Potts¹,

Ellis²,

Kregsamer³

et al. 1999

J. Anal. At. Spectrom.

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Elemental analysis by high‐energy electron excitation

2004

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The possibility of using high‐energy β‐particles (102–103 keV) to induce the emission of characteristic x‐rays from pure chemical elements, with important improvements with respect to conventional excitation methods, has been recently reviewed. An excitation procedure named BIXE (β‐induced x‐ray emission) is used for implementing a spectrometric technique along the lines developed for EPMA (electron probe microanalysis). We have found that by using BIXE it is possible to determine binary sample compositions of elements present at concentrations higher than 1%, by comparisons with reference samples to obtain calibration curves. Experience with EPMA shows that when ternary and higher order samples are analyzed, the use of reference samples is not enough and it is necessary to perform theoretical corrections to the relationship between the line intensity and the corresponding concentrations, as a suitable complement to the analytical procedure. Semi‐quantitative results are thus obtained with corrections applied through the ZAF method usually used in EPMA. In this work we concentrated in finding whether calibration curves as used in EPMA (where the electron beam is monochromatic) can be used in BIXE, where the electron beam is polychromatic (the β spectrum). We expect that BIXE can be developed as a spectrometric technique whose main advantages are that it is a low‐cost technique suitable for in situ studies and that the experimental arrangement and data acquisition and its evaluation are comparatively simple. Copyright © 2004 John Wiley & Sons, Ltd.

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Characteristic X-rays induced by electrons and positrons from β-emitting radioisotopes

Cited by 6 publications

References 15 publications

Kerma and Photons Absorbed-Dose from Ir-192 HDR Seeds

Kerma and Photons Absorbed-Dose from Ir-192 HDR Seeds

X-ray fluorescence spectrometry

Elemental analysis by high‐energy electron excitation

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