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- Title
PATIENT NEUTRON DOSE EQUIVALENT EXPOSURES OUTSIDE OF THE PROTON THERAPY TREATMENT FIELD.
- Authors
Polf, J. C.; Newhauser, W. D.; Titt, U.
- Abstract
A large fraction of dose to healthy tissue located outside of the treatment field during proton therapy is attributable to neutrons produced in the beam-delivery apparatus. In this work, the neutron dose equivalent (H) per therapeutic proton absorbed dose (D) was estimated for typical treatment conditions as a function of range modulation width, angle with respect to the incident proton beam, and the distance from the isocentre at the Harvard Cyclotron Laboratory's (Cambridge, MA) passively spread treatment field using Monte Carlo simulations. For a beam with 16 cm penetration (depth) and a 5 × 5 cm2 lateral field size at the patient location along the incident beam direction at 100 cm from the isocentre, the predicted HID values are 0.35 and 0.60 mSv Gy-1 from the simulations and measurements, respectively. At all locations, the predicted HID values are within a factor of 2 and 3 of the measured result for no modulation and 8.2 cm of modulation, respectively.
- Subjects
RADIATION dosimetry; MONTE Carlo method; NEUTRONS spectra; PARTICLES (Nuclear physics); NUCLEAR physics; CYCLOTRONS
- Publication
Radiation Protection Dosimetry, 2005, Vol 115, Issue 1-4, p154
- ISSN
0144-8420
- Publication type
Article
- DOI
10.1093/rpd/nci264