Open AccessCharacterisation of the half-field beam penumbra for a variety of blocking set-ups
Author(s) -
Shaun Smith,
Tanya Kairn,
Scott Crowe,
Andre Asena,
Jamie Trapp
Publication year - 2015
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/573/1/012073
Subject(s) - penumbra , blocking (statistics) , beam (structure) , monte carlo method , optics , field (mathematics) , physics , materials science , computer science , mathematics , medicine , statistics , computer network , ischemia , pure mathematics , cardiology
Measurements of half-field beam penumbra were taken using EBT2 film for a variety of blocking techniques. It was shown that minimizing the SSD reduces the penumbra as the effects of beam divergence are diminished. The addition of a lead block directly on the surface provides optimal results with a 10-90% penumbra of 0.53 ± 0.02 cm. To resolve the uncertainties encountered in film measurements, future Monte Carlo measurements of halffield penumbras are to be conducted