# OnCo record proton-range-uncertainty (term). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)". Whole corpus: https://onco.cc/api/v1/onco.nt
@prefix schema: .
@prefix onco: .
@prefix xsd: .
a schema:DefinedTerm ;
onco:kind "term" ;
schema:identifier "proton-range-uncertainty" ;
schema:name "Proton range uncertainty and the range margin"@en ;
schema:alternateName "range uncertainty"@en, "proton range uncertainty"@en, "range margin"@en ;
schema:description "A proton beam stops at a depth that cannot be predicted exactly, so planners deliberately aim it a few millimetres past the tumour. At one leading centre the allowance is 3.5 per cent of the beam's range plus 1 millimetre, which for a beam reaching 20 centimetres into soft tissue means overshooting by about 8 millimetres."@en ;
schema:url ;
schema:dateModified "2026-10-20"^^xsd:date ;
schema:citation , ;
onco:tag "precision", "radiation" ;
onco:related , ;
onco:sections ;
onco:technologies , , , ;
onco:terms , , , ;
onco:keyPapers , , .