Radiation Safety Considerations in Proton Aperture Disposal
- 1 April 2014
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Health Physics
- Vol. 106 (4), 523-527
- https://doi.org/10.1097/hp.0b013e3182a2a725
Abstract
Beam shaping in scattered and uniform scanned proton beam therapy (PBT) is made commonly by brass apertures. Due to proton interactions, these devices become radioactive and could pose safety issues and radiation hazards. Nearly 2,000 patient-specific devices per year are used at Indiana University Cyclotron Operations (IUCO) and IU Health Proton Therapy Center (IUHPTC); these devices require proper guidelines for disposal. IUCO practice has been to store these apertures for at least 4 mo to allow for safe transfer to recycling contractors. The devices require decay in two staged secure locations, including at least 4 mo in a separate building, at which point half are ready for disposal. At 6 mo, 20–30% of apertures require further storage. This process requires significant space and manpower and should be considered in the design process for new clinical facilities. More widespread adoption of pencil beam or spot scanning nozzles may obviate this issue, as apertures then will no longer be necessary.Keywords
This publication has 9 references indexed in Scilit:
- Dosimetric comparison between proton and photon beams in the moving gap region in cranio-spinal irradiation (CSI)Acta Oncologica, 2012
- Beam characteristics in two different proton uniform scanning systems: A side-by-side comparisonMedical Physics, 2012
- Pitfalls of tungsten multileaf collimator in proton beam therapyMedical Physics, 2011
- Influence of beam efficiency through the patient-specific collimator on secondary neutron dose equivalent in double scattering and uniform scanning modes of proton therapyMedical Physics, 2010
- Scan pattern optimization for uniform proton beam scanningMedical Physics, 2009
- Clinical characterization of a proton beam continuous uniform scanning system with dose layer stackingMedical Physics, 2008
- Multichannel detectors for profile measurements in clinical proton fieldsMedical Physics, 2007
- An investigation of photonuclear reactions in Cerrobend eutectic material with an 18 MV linacPhysics in Medicine & Biology, 1991
- Patient activation with a 25 MV therapeutic X-ray beamThe British Journal of Radiology, 1988