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SUMMARY:Spatial dosimetric response of an ionisation chamber to kilovoltag
 e synchrotron radiation by 2D scanning in a sub-millimetre beam
DTSTART;VALUE=DATE-TIME:20141120T053000Z
DTEND;VALUE=DATE-TIME:20141120T055000Z
DTSTAMP;VALUE=DATE-TIME:20260608T210037Z
UID:indico-contribution-661@events01.synchrotron.org.au
DESCRIPTION:Speakers: Duncan Butler (ARPANSA)\nThe IMBL at the Australian 
 Synchrotron is able to provide high-brightness kilovoltage radiation in th
 e energy range 20 – 200 keV. A PTW 30013 Farmer-type ionisation chamber 
 was scanned through a point-like (sub-millimetre) beam and the ionisation 
 signal from the chamber was recorded as a function of position. In this wa
 y an image was constructed from the spatial dosimetric response of the cha
 mber. Such information can be used to determine\, for example\, the fracti
 on of response from the chamber stem to the overall response of the chambe
 r. Other interesting features include the contribution from the aluminium 
 central electrode\, and increased response where the walls are side-on to 
 the beam (and therefore contribute a greater number of secondary electrons
  to the air cavity). The results are compared to a Monte Carlo model. Dosi
 metric response maps should be useful for investigating the design of ioni
 sation chambers for radiotherapy.\n\nhttps://events01.synchrotron.org.au/e
 vent/3/contributions/661/
LOCATION: Conference Room AS
URL:https://events01.synchrotron.org.au/event/3/contributions/661/
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