Lin JP, Liu WC, Lin CC. Investigation of photoneutron dose equivalent from high-energy photons in radiotherapy.
Appl Radiat Isot 2007;
65:599-604. [PMID:
17350273 DOI:
10.1016/j.apradiso.2007.01.017]
[Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2006] [Revised: 01/04/2007] [Accepted: 01/16/2007] [Indexed: 11/15/2022]
Abstract
Spatial distribution of photoneutron dose equivalent during radiotherapy at different beam size, depth, and distance from a 15 MV linear accelerator was investigated with bubble detectors in a water phantom. The photoneutron dose equivalent was mainly from fast neutrons, and decreased with distance at a fixed field and with depth. Besides, photoneutron dose equivalent was slightly affected by beam size due to the variation of tungsten area exposed in the beam direction and photoneutrons occurred at the jaws. Fast photoneutron dose equivalent of shallow critical organs was represented still considerably outside the beam size.
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