2021
DOI: 10.1088/1748-0221/16/03/p03006
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Monte Carlo calculation of Spencer-Attix and Bragg-Gray stopping-power ratios of tissue-to-air for ISO reference beta sources — an EGSnrc study

Abstract: On-axis Spencer-Attix and Bragg-Gray stopping power ratios of tissue-to-air are calculated for 25 radiation fields of ISO beta sources 147Pm, 85Kr, 90Sr/90Y and 106Ru/106Rh using the EGSnrc-based Monte Carlo code system. These values are calculated at 5 and 70 μm depths in a unit density ICRU 4-element tissue phantom, separately, for beta and photon fields using the published phase-space data at different distances with or without beam flattening filter. The study shows that the calculated values of stopping p… Show more

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Cited by 5 publications
(3 citation statements)
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“…From the two new radiation fields, the spectral information is freely available [6]. From these data, corresponding Spencer-Attix stopping power ratios, s t,a (l) SA , depending on the chamber depth, l, were calculated using the method described above [17], the results will be published in [18]. Their ratio to the Bragg-Gray stopping power ratio, s t,a (0) BG , see table A9 in appendix A, can be interpreted as correction factor k SA to apply the Spencer-Attix theory:…”
Section: Use Of the Spencer-attix Theory Via Correction Factor K Samentioning
confidence: 99%
“…From the two new radiation fields, the spectral information is freely available [6]. From these data, corresponding Spencer-Attix stopping power ratios, s t,a (l) SA , depending on the chamber depth, l, were calculated using the method described above [17], the results will be published in [18]. Their ratio to the Bragg-Gray stopping power ratio, s t,a (0) BG , see table A9 in appendix A, can be interpreted as correction factor k SA to apply the Spencer-Attix theory:…”
Section: Use Of the Spencer-attix Theory Via Correction Factor K Samentioning
confidence: 99%
“…The parameters c 0 , c 1 and c 2 obtained from the regression are listed for several sources in table C5 in appendix C for BPS1. Figure 8 shows the data from the literature [23,24] and the corresponding polynomial regressions according equation (15). For a chamber depth of 1000 µm this results in values for k SA of 1.0036, 1.0045, 1.0057 and 1.0074 for 147 Pm at a distance of 20 cm, 85 Kr at a distance of 30 cm, 90 Sr/ 90 Y at a distance of 30 cm and 106 Ru/ 106 Rh also at a distance of 30 cm, all with a beam flattening filter, respectively.…”
Section: Use Of the Spencer-attix Theory Via Correction Factor K Samentioning
confidence: 99%
“…The Spencer-Attix cavity theory is considered to be more accurate than the Bragg-Gray one as it accounts for the variation in the response measured as a function of cavity dimension whereas the Bragg-Gray theory does not. Therefore, the Spencer-Attix stopping power ratios depending on the chamber depth have been calculated [43,44]. Corresponding correction factors were determined [33,34] and added in ISO 6980-2.…”
Section: Inclusion Of a Correction Factor For Primary Dosimetry To Us...mentioning
confidence: 99%