Matches in SemOpenAlex for { <https://semopenalex.org/work/W1990929202> ?p ?o ?g. }
Showing items 1 to 76 of
76
with 100 items per page.
- W1990929202 endingPage "329" @default.
- W1990929202 startingPage "329" @default.
- W1990929202 abstract "Purpose: All present dosimetry protocols recommend well-guarded parallel-plate ion chambers for electron dosimetry. For the guard-less Markus chamber an energy dependent fluence perturbation correction pcav is given. This perturbation correction was experimentally determined by van der Plaetsen by comparison of the read-out of a Markus and a NACP chamber, which was assumed to be “perturbation-free”. Aim of the present study is a Monte Carlo based reiteration of this experiment. Methods: Detailed models of four parallel-plate chambers (Roos, Markus, NACP and Advanced Markus) were designed using the Monte Carlo code EGSnrc and placed in a water phantom. For all chambers the dose to the active volume filled with low density water was calculated for 13 clinical electron spectra (E0=6-21 MeV) at the depth of maximum and at the reference depth under reference conditions. In all cases the chamber's reference point was positioned at the depth of measurement. Moreover, the dose to water DW was calculated in a small water voxel positioned at the same depth. Results: The calculated dose ratio DNACP/DMarkus, which according to van der Plaetsen reflects the fluence perturbation correction of the Markus chamber, deviates less from unity than the values given by van der Plaetsen's but exhibits a similar energy dependence. The same holds for the dose ratios of the other well guarded chambers. But, in comparison to water, the Markus chamber reveals the smallest overall perturbation correction which is nearly energy independent at both investigated depths. Conclusion: The simulations principally confirm the energy dependence of the dose ratio DNACP/DMarkus as published by van der Plaetsen. But, as shown by our simulations of the ratio DW/DMarkus, the conclusion drawn in all dosimetry protocols is questionable: in contrast to all well-guarded chambers the guard-less Markus chamber reveals the smallest overall perturbation correction and also the smallest energy dependence." @default.
- W1990929202 created "2016-06-24" @default.
- W1990929202 creator A5006319911 @default.
- W1990929202 creator A5048756733 @default.
- W1990929202 date "2014-05-29" @default.
- W1990929202 modified "2023-09-27" @default.
- W1990929202 title "SU-E-T-448: On the Perturbation Factor P_cav of the Markus Parallel Plate Ion Chambers in Clinical Electron Beams, Monte Carlo Based Reintegration of An Historical Experiment" @default.
- W1990929202 doi "https://doi.org/10.1118/1.4888781" @default.
- W1990929202 hasPublicationYear "2014" @default.
- W1990929202 type Work @default.
- W1990929202 sameAs 1990929202 @default.
- W1990929202 citedByCount "0" @default.
- W1990929202 crossrefType "journal-article" @default.
- W1990929202 hasAuthorship W1990929202A5006319911 @default.
- W1990929202 hasAuthorship W1990929202A5048756733 @default.
- W1990929202 hasConcept C104293457 @default.
- W1990929202 hasConcept C105795698 @default.
- W1990929202 hasConcept C120665830 @default.
- W1990929202 hasConcept C121332964 @default.
- W1990929202 hasConcept C145148216 @default.
- W1990929202 hasConcept C147120987 @default.
- W1990929202 hasConcept C151770136 @default.
- W1990929202 hasConcept C177918212 @default.
- W1990929202 hasConcept C184779094 @default.
- W1990929202 hasConcept C185544564 @default.
- W1990929202 hasConcept C19499675 @default.
- W1990929202 hasConcept C198291218 @default.
- W1990929202 hasConcept C22078206 @default.
- W1990929202 hasConcept C2989005 @default.
- W1990929202 hasConcept C30475298 @default.
- W1990929202 hasConcept C33923547 @default.
- W1990929202 hasConcept C62520636 @default.
- W1990929202 hasConcept C71924100 @default.
- W1990929202 hasConcept C75088862 @default.
- W1990929202 hasConcept C90774946 @default.
- W1990929202 hasConceptScore W1990929202C104293457 @default.
- W1990929202 hasConceptScore W1990929202C105795698 @default.
- W1990929202 hasConceptScore W1990929202C120665830 @default.
- W1990929202 hasConceptScore W1990929202C121332964 @default.
- W1990929202 hasConceptScore W1990929202C145148216 @default.
- W1990929202 hasConceptScore W1990929202C147120987 @default.
- W1990929202 hasConceptScore W1990929202C151770136 @default.
- W1990929202 hasConceptScore W1990929202C177918212 @default.
- W1990929202 hasConceptScore W1990929202C184779094 @default.
- W1990929202 hasConceptScore W1990929202C185544564 @default.
- W1990929202 hasConceptScore W1990929202C19499675 @default.
- W1990929202 hasConceptScore W1990929202C198291218 @default.
- W1990929202 hasConceptScore W1990929202C22078206 @default.
- W1990929202 hasConceptScore W1990929202C2989005 @default.
- W1990929202 hasConceptScore W1990929202C30475298 @default.
- W1990929202 hasConceptScore W1990929202C33923547 @default.
- W1990929202 hasConceptScore W1990929202C62520636 @default.
- W1990929202 hasConceptScore W1990929202C71924100 @default.
- W1990929202 hasConceptScore W1990929202C75088862 @default.
- W1990929202 hasConceptScore W1990929202C90774946 @default.
- W1990929202 hasIssue "6Part18" @default.
- W1990929202 hasLocation W19909292021 @default.
- W1990929202 hasOpenAccess W1990929202 @default.
- W1990929202 hasPrimaryLocation W19909292021 @default.
- W1990929202 hasRelatedWork W1789506614 @default.
- W1990929202 hasRelatedWork W1983771063 @default.
- W1990929202 hasRelatedWork W1990929202 @default.
- W1990929202 hasRelatedWork W1995326134 @default.
- W1990929202 hasRelatedWork W2002836665 @default.
- W1990929202 hasRelatedWork W2015224606 @default.
- W1990929202 hasRelatedWork W2027014302 @default.
- W1990929202 hasRelatedWork W2067826630 @default.
- W1990929202 hasRelatedWork W2091372210 @default.
- W1990929202 hasRelatedWork W2497870403 @default.
- W1990929202 hasVolume "41" @default.
- W1990929202 isParatext "false" @default.
- W1990929202 isRetracted "false" @default.
- W1990929202 magId "1990929202" @default.
- W1990929202 workType "article" @default.