Neutron dose equivalent measured at the maze door with various openings for the jaws and MLC.
Identifieur interne : 000B81 ( Main/Exploration ); précédent : 000B80; suivant : 000B82Neutron dose equivalent measured at the maze door with various openings for the jaws and MLC.
Auteurs : RBID : pubmed:22380359English descriptors
- KwdEn :
- MESH :
- instrumentation : Particle Accelerators.
- Neutrons, Radiation Dosage, Time Factors.
Abstract
This study was undertaken to explore the effects of the jaws and the MLC openings on the neutron dose equivalent (DE) at the maze door and neutron flux at the patient plane.
DOI: 10.1118/1.3682313
PubMed: 22380359
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Neutron dose equivalent measured at the maze door with various openings for the jaws and MLC.</title><author><name sortKey="Krmar, M" uniqKey="Krmar M">M Krmar</name><affiliation><nlm:affiliation>Physics Department, University of Novi Sad, Novi Sad, Serbia. krmar@df.uns.ac.rs</nlm:affiliation><country wicri:rule="url">Serbie</country></affiliation></author><author><name sortKey="Baucal, M" uniqKey="Baucal M">M Baucal</name></author><author><name sortKey="Bozic, N" uniqKey="Bozic N">N Bozic</name></author><author><name sortKey="Jovancevic, N" uniqKey="Jovancevic N">N Jovancevic</name></author><author><name sortKey="Ciraj Bjelac, O" uniqKey="Ciraj Bjelac O">O Ciraj-Bjelac</name></author></titleStmt><publicationStmt><date when="2012">2012</date><idno type="doi">10.1118/1.3682313</idno><idno type="RBID">pubmed:22380359</idno><idno type="pmid">22380359</idno><idno type="wicri:Area/Main/Corpus">000E63</idno><idno type="wicri:Area/Main/Curation">000E63</idno><idno type="wicri:Area/Main/Exploration">000B81</idno></publicationStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Neutrons</term><term>Particle Accelerators (instrumentation)</term><term>Radiation Dosage</term><term>Time Factors</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Particle Accelerators</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Neutrons</term><term>Radiation Dosage</term><term>Time Factors</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This study was undertaken to explore the effects of the jaws and the MLC openings on the neutron dose equivalent (DE) at the maze door and neutron flux at the patient plane.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">22380359</PMID><DateCreated><Year>2012</Year><Month>03</Month><Day>02</Day></DateCreated><DateCompleted><Year>2013</Year><Month>06</Month><Day>03</Day></DateCompleted><Article PubModel="Print"><Journal><ISSN IssnType="Print">0094-2405</ISSN><JournalIssue CitedMedium="Print"><Volume>39</Volume><Issue>3</Issue><PubDate><Year>2012</Year><Month>Mar</Month></PubDate></JournalIssue><Title>Medical physics</Title><ISOAbbreviation>Med Phys</ISOAbbreviation></Journal><ArticleTitle>Neutron dose equivalent measured at the maze door with various openings for the jaws and MLC.</ArticleTitle><Pagination><MedlinePgn>1278-81</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1118/1.3682313</ELocationID><Abstract><AbstractText Label="PURPOSE" NlmCategory="OBJECTIVE">This study was undertaken to explore the effects of the jaws and the MLC openings on the neutron dose equivalent (DE) at the maze door and neutron flux at the patient plane.</AbstractText><AbstractText Label="METHODS" NlmCategory="METHODS">The neutron dose equivalent was measured at the maze entrance door of a 15 MV therapy linear accelerator room. All measurements were performed using various field sizes up to 40 cm × 40 cm. Activation detectors constructed from natural Indium (In) were exposed at Cd envelope to neutrons in order to estimate relative changes of epithermal neutron fluences in the patient plane.</AbstractText><AbstractText Label="RESULTS" NlmCategory="RESULTS">Our study showed that the dose equivalent at the maze door is at the highest when the jaw are closed and that maximal jaws opening reduces the DE by more than 20%. The neutron dose equivalent at the maze door measured for radiation fields defined by jaws do not differ significantly from the DE measured when MLC determines the same size radiation field. The epithermal capture reaction rate measured using different jaw openings differs by approximately 10%. When an MLC leaf is inserted into a fixed geometry for one opening of the jaws, an increase of the epithermal neutron capture reaction rate in Indium activation detectors was observed.</AbstractText><AbstractText Label="CONCLUSIONS" NlmCategory="CONCLUSIONS">There is no significant difference in the neutron DE when MLC defines radiation field instead of jaws. This leads to the conclusion that the overall number of neutrons remains similar and it does not depend on how primary photon beam was stopped-by the jaws or the MLC. An increase of the fast neutron capture reaction rate when MLC leaves are inserted probably originates from the neutron scattering.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Krmar</LastName><ForeName>M</ForeName><Initials>M</Initials><Affiliation>Physics Department, University of Novi Sad, Novi Sad, Serbia. krmar@df.uns.ac.rs</Affiliation></Author><Author ValidYN="Y"><LastName>Baucal</LastName><ForeName>M</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Bozic</LastName><ForeName>N</ForeName><Initials>N</Initials></Author><Author ValidYN="Y"><LastName>Jovancevic</LastName><ForeName>N</ForeName><Initials>N</Initials></Author><Author ValidYN="Y"><LastName>Ciraj-Bjelac</LastName><ForeName>O</ForeName><Initials>O</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType><PublicationType>Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Med Phys</MedlineTA><NlmUniqueID>0425746</NlmUniqueID><ISSNLinking>0094-2405</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="Y">Neutrons</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Particle Accelerators</DescriptorName><QualifierName MajorTopicYN="Y">instrumentation</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Radiation Dosage</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Time Factors</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2012</Year><Month>3</Month><Day>3</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2012</Year><Month>3</Month><Day>3</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2013</Year><Month>6</Month><Day>5</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1118/1.3682313</ArticleId><ArticleId IdType="pubmed">22380359</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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