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Spectroscopic Study of Radiation around the Leksell Gamma Knife for Room Shielding Applications
KTH, School of Technology and Health (STH). Elekta AB.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Spektroskopisk Studie av Strålning runt Leksell Gamma Knife för Rumsavskärmningsapplikationer (Swedish)
Abstract [en]

Any center planning to install a Gamma Knife radiosurgery unit has to provide for an efficient shielding of the treatment room, to protect the patient, the staff and the public, against undesired radiation. The shielding barrier design is controlled by national and international recommendations; the reference documents for gamma ray radiotherapy facilities are the National Council on Radiation Protection and Measurements (NCRP) reports 49 and 151. However, some facts highlighted in this thesis point out that NCRP methods are ill-adapted to the Gamma Knife. Spectroscopic measurements were performed around the Gamma Knife with a Germanium detector. They revealed that the radiation field contains few high energy photons, is highly anisotropic, and that the leakage level is much lower than the NCRP estimation. These observations led to the development of a new approach to determine the necessary shielding, based on the actual and directly measurable radiation field around the unit. This method would reduce the shielding oversizing induced by the unsuitability of the NCRP recommendations for the Gamma Knife.

Place, publisher, year, edition, pages
2017. , p. 62
Series
TRITA-STH ; 2017:5
Keywords [en]
Gamma Knife, Elekta, spectra, spectroscopic, radiation, Monte Carlo, shielding
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-202108OAI: oai:DiVA.org:kth-202108DiVA, id: diva2:1075154
External cooperation
Elekta Ab
Subject / course
Medical Engineering
Educational program
Master of Science - Medical Engineering
Presentation
2017-01-20, T55, Hälsov. 11C, Flemingsberg, 09:00 (English)
Supervisors
Examiners
Available from: 2017-02-17 Created: 2017-02-17 Last updated: 2017-02-17Bibliographically approved

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CiteExportLink to record
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