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dc.contributor.authorPerrin, Bruce A
dc.contributor.authorWalker, Anne
dc.contributor.authorMackay, Ranald I
dc.date.accessioned2009-08-21T14:11:42Z
dc.date.available2009-08-21T14:11:42Z
dc.date.issued2003-03-07
dc.identifier.citationA model to calculate the induced dose rate around an 18 MV ELEKTA linear accelerator. 2003, 48 (5):N75-81 Phys Med Biolen
dc.identifier.issn0031-9155
dc.identifier.pmid12696804
dc.identifier.urihttp://hdl.handle.net/10541/78218
dc.description.abstractThe dose rate due to activity induced by (gamma, n) reactions around an ELEKTA Precise accelerator running at 18 MV is reported. A model to calculate the induced dose rate for a variety of working practices has been derived and compared to the measured values. From this model, the dose received by the staff using the machine can be estimated. From measured dose rates at the face of the linear accelerator for a 10 x 10 cm2 jaw setting at 18 MV an activation coefficient per MU was derived for each of the major activation products. The relative dose rates at points around the linac head, for different energy and jaw settings, were measured. Dose rates adjacent to the patient support system and portal imager were also measured. A model to calculate the dose rate at these points was derived, and compared to those measured over a typical working week. The model was then used to estimate the maximum dose to therapists for the current working schedule on this machine. Calculated dose rates at the linac face agreed to within +/- 12% of those measured over a week, with a typical dose rate of 4.5 microSv h(-1) 2 min after the beam has stopped. The estimated maximum annual whole body dose for a treatment therapist, with the machine treating at only 18 MV, for 60000 MUs per week was 2.5 mSv. This compares well with value of 2.9 mSv published for a Clinac 21EX. A model has been derived to calculate the dose from the four dominant activation products of an ELEKTA Precise 18 MV linear accelerator. This model is a useful tool to calculate the induced dose rate around the treatment head. The model can be used to estimate the dose to the staff for typical working patterns.
dc.language.isoenen
dc.subject.meshComputer Simulation
dc.subject.meshHumans
dc.subject.meshModels, Biological
dc.subject.meshOccupational Exposure
dc.subject.meshOccupational Health
dc.subject.meshParticle Accelerators
dc.subject.meshPersonnel, Hospital
dc.subject.meshRadiation Dosage
dc.subject.meshRadiation Injuries
dc.subject.meshRadiation Monitoring
dc.subject.meshRadiation Protection
dc.subject.meshRadiometry
dc.subject.meshRadiotherapy, High-Energy
dc.titleA model to calculate the induced dose rate around an 18 MV ELEKTA linear accelerator.en
dc.typeArticleen
dc.contributor.departmentNorth Western Medical Physics, Christie Hospital (NHS) Trust, Wilmslow Road, Withington, Manchester, M20 4BX, UK. Bruce.Perrin@physics.cr.man.ac.uken
dc.identifier.journalPhysics in Medicine and Biologyen
html.description.abstractThe dose rate due to activity induced by (gamma, n) reactions around an ELEKTA Precise accelerator running at 18 MV is reported. A model to calculate the induced dose rate for a variety of working practices has been derived and compared to the measured values. From this model, the dose received by the staff using the machine can be estimated. From measured dose rates at the face of the linear accelerator for a 10 x 10 cm2 jaw setting at 18 MV an activation coefficient per MU was derived for each of the major activation products. The relative dose rates at points around the linac head, for different energy and jaw settings, were measured. Dose rates adjacent to the patient support system and portal imager were also measured. A model to calculate the dose rate at these points was derived, and compared to those measured over a typical working week. The model was then used to estimate the maximum dose to therapists for the current working schedule on this machine. Calculated dose rates at the linac face agreed to within +/- 12% of those measured over a week, with a typical dose rate of 4.5 microSv h(-1) 2 min after the beam has stopped. The estimated maximum annual whole body dose for a treatment therapist, with the machine treating at only 18 MV, for 60000 MUs per week was 2.5 mSv. This compares well with value of 2.9 mSv published for a Clinac 21EX. A model has been derived to calculate the dose from the four dominant activation products of an ELEKTA Precise 18 MV linear accelerator. This model is a useful tool to calculate the induced dose rate around the treatment head. The model can be used to estimate the dose to the staff for typical working patterns.


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