liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Response of Lithium Formate EPR Dosimeters at Photon Energies Relelvant to Brachytherapy
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-0209-498X
Statens Strålskyddsinstitut, Stockholm.
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences.
Show others and affiliations
2009 (English)In: IFMBE Proceedings, Heidelberg: Springer Berlin Heidelberg , 2009, 236-239 p.Conference paper, Published paper (Other academic)
Abstract [en]

After development of sensitive dosimeter materials Electron Paramagnetic Resonance EPR dosimetry has been successfully used also in radiation therapy. The intensity of the EPR-signal is a measure of the amount of free radicals created by ionizing radiation which is proportional to the absorbed dose in the dosimeter. Lithium formate monohydrate is a dosimeter material with 2-6 times higher sensitivity than alanine, a linear dose response over a wide dose range and mass-energy absorption properties similar to water. These properties make lithium formate promising for verification of absorbed doses around high dose rate brachytherapy sources where the dose gradient is steep and the photon energy distribution changing with distance from the source. Calibration of the dosimeters is performed in 60Co or MV photon beams where high dosimetric accuracy is feasible. The use in brachytherapy field relies on the assumption that the production of free radicals per mean absorbed dose in the dosimeter is similar at the lower photon energies present there. The aim of this work was to test that assumption. The response of the dosimeters as a function of photon energy was determined by irradiations with four x-ray qualities in the range 100-250 kV and 137Cs, relative to the response when irradiated with 60Co, all photon beams with well-known air kerma rates at the Swedish Secondary Standards Dosimetry Laboratory. Monte Carlo simulations were used to convert air kerma free in air to mean absorbed dose to the dosimeter. The measured response relative 60Co as a function of photon energy was below unity for all qualities. The maximum deviation from unity was 2.5% (100 kV, 135 kV) with a relative standard deviation of 1.5% (k = 1).

Place, publisher, year, edition, pages
Heidelberg: Springer Berlin Heidelberg , 2009. 236-239 p.
Series
IFMBE Proceedings, ISSN 1680-0737 ; 25/1
Keyword [en]
HDR brachytherapy, dosimeter, EPR, lithium formate, energy response
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-59711DOI: 10.1007/978-3-642-03474-9_67ISBN: 978-3-642-03472-5 (print)ISBN: 978-3-642-03474-9 (print)OAI: oai:DiVA.org:liu-59711DiVA: diva2:353026
Conference
World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany
Available from: 2010-09-23 Created: 2010-09-23 Last updated: 2015-03-20

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Adolfsson, EmelieAlm Carlsson, GudrunGustafsson, HåkanLund, EvaCarlsson Tedgren, Åsa

Search in DiVA

By author/editor
Adolfsson, EmelieAlm Carlsson, GudrunGustafsson, HåkanLund, EvaCarlsson Tedgren, Åsa
By organisation
Radiation PhysicsFaculty of Health SciencesDepartment of Radiation Physics
Medical and Health Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 224 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf