Matches in SemOpenAlex for { <https://semopenalex.org/work/W2060165610> ?p ?o ?g. }
Showing items 1 to 80 of
80
with 100 items per page.
- W2060165610 abstract "Purpose: To evaluate the neutron and photon dose equivalent (Hn,D and HG) at the outer maze entrance after the removal of the flattening filter of a Varian Clinac 23EX accelerator; and to evaluate the effectiveness of semiempirical calculations for a flattening filter free (FFF) accelerator. Methods: A Varian Clinac 23EX accelerator was used to produce 18 MV photons without the flattening filter. The Hn,D was measured using an Andersson‐Braun neutron Rem meter, and the HG was measured using a Geiger Muller gamma‐ray survey meter at the outer maze entrance. The measurements were compared with semiempirical calculations such as the Kersey method, the modified Kersey method and a newly proposed method by Falcao et al. Results: With the gantry head tilted close to the inner maze entrance and with the jaws closed, the neutron dose equivalent reached its maximum. The FFF dose equivalent per monitor unit (MU) is 14 –41% lower than that of a flattened beam under different field size and gantry angle settings. The calculation to measurement ratio of the Hn,D was 4.6 for the Kersey method and 16.7 for the Falcao method. The modified Kersey method has a calculation to measurement ratio about 0.8. The total photon dose equivalent calculation using formulae in NCRP report No. 151 is about 1.5 times of the measurement. Conclusions: This work indicates that the neutron production per MU from a flattening filter free accelerator is reduced at the maze entrance. The Kersey method and the Falcao method overestimate the neutron dose equivalent. The modified Kersey method gives the closest estimation of a Varian Clinac 23EX accelerator operated at 18 MV photon mode without flattening filter in a maze with a similar design as in our study. However, its tendency to underestimate the Hn,D need to be considered during shielding calculation." @default.
- W2060165610 created "2016-06-24" @default.
- W2060165610 creator A5003563985 @default.
- W2060165610 creator A5009118263 @default.
- W2060165610 creator A5058868870 @default.
- W2060165610 creator A5080750138 @default.
- W2060165610 creator A5086101001 @default.
- W2060165610 date "2011-06-01" @default.
- W2060165610 modified "2023-09-26" @default.
- W2060165610 title "MO-F-BRA-06: Neutron Dose Equivalent at the Maze Entrance of a Flattening Filter Free Accelerator" @default.
- W2060165610 doi "https://doi.org/10.1118/1.3613001" @default.
- W2060165610 hasPublicationYear "2011" @default.
- W2060165610 type Work @default.
- W2060165610 sameAs 2060165610 @default.
- W2060165610 citedByCount "0" @default.
- W2060165610 crossrefType "journal-article" @default.
- W2060165610 hasAuthorship W2060165610A5003563985 @default.
- W2060165610 hasAuthorship W2060165610A5009118263 @default.
- W2060165610 hasAuthorship W2060165610A5058868870 @default.
- W2060165610 hasAuthorship W2060165610A5080750138 @default.
- W2060165610 hasAuthorship W2060165610A5086101001 @default.
- W2060165610 hasConcept C106131492 @default.
- W2060165610 hasConcept C119599485 @default.
- W2060165610 hasConcept C120665830 @default.
- W2060165610 hasConcept C121332964 @default.
- W2060165610 hasConcept C127413603 @default.
- W2060165610 hasConcept C1276947 @default.
- W2060165610 hasConcept C152568617 @default.
- W2060165610 hasConcept C159317903 @default.
- W2060165610 hasConcept C168834538 @default.
- W2060165610 hasConcept C180048950 @default.
- W2060165610 hasConcept C184779094 @default.
- W2060165610 hasConcept C185544564 @default.
- W2060165610 hasConcept C19444555 @default.
- W2060165610 hasConcept C2989005 @default.
- W2060165610 hasConcept C71924100 @default.
- W2060165610 hasConcept C75088862 @default.
- W2060165610 hasConceptScore W2060165610C106131492 @default.
- W2060165610 hasConceptScore W2060165610C119599485 @default.
- W2060165610 hasConceptScore W2060165610C120665830 @default.
- W2060165610 hasConceptScore W2060165610C121332964 @default.
- W2060165610 hasConceptScore W2060165610C127413603 @default.
- W2060165610 hasConceptScore W2060165610C1276947 @default.
- W2060165610 hasConceptScore W2060165610C152568617 @default.
- W2060165610 hasConceptScore W2060165610C159317903 @default.
- W2060165610 hasConceptScore W2060165610C168834538 @default.
- W2060165610 hasConceptScore W2060165610C180048950 @default.
- W2060165610 hasConceptScore W2060165610C184779094 @default.
- W2060165610 hasConceptScore W2060165610C185544564 @default.
- W2060165610 hasConceptScore W2060165610C19444555 @default.
- W2060165610 hasConceptScore W2060165610C2989005 @default.
- W2060165610 hasConceptScore W2060165610C71924100 @default.
- W2060165610 hasConceptScore W2060165610C75088862 @default.
- W2060165610 hasLocation W20601656101 @default.
- W2060165610 hasOpenAccess W2060165610 @default.
- W2060165610 hasPrimaryLocation W20601656101 @default.
- W2060165610 hasRelatedWork W1240151541 @default.
- W2060165610 hasRelatedWork W1964407230 @default.
- W2060165610 hasRelatedWork W1990531644 @default.
- W2060165610 hasRelatedWork W2005584927 @default.
- W2060165610 hasRelatedWork W2023009407 @default.
- W2060165610 hasRelatedWork W2024102961 @default.
- W2060165610 hasRelatedWork W2040082937 @default.
- W2060165610 hasRelatedWork W2060888191 @default.
- W2060165610 hasRelatedWork W2064215448 @default.
- W2060165610 hasRelatedWork W2071137937 @default.
- W2060165610 hasRelatedWork W2077477113 @default.
- W2060165610 hasRelatedWork W2088466708 @default.
- W2060165610 hasRelatedWork W2099262673 @default.
- W2060165610 hasRelatedWork W2253999459 @default.
- W2060165610 hasRelatedWork W2403387645 @default.
- W2060165610 hasRelatedWork W2473316055 @default.
- W2060165610 hasRelatedWork W2762564536 @default.
- W2060165610 hasRelatedWork W2942922379 @default.
- W2060165610 hasRelatedWork W3005450271 @default.
- W2060165610 hasRelatedWork W2185672927 @default.
- W2060165610 isParatext "false" @default.
- W2060165610 isRetracted "false" @default.
- W2060165610 magId "2060165610" @default.
- W2060165610 workType "article" @default.