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room survey

Journal of Radiotherapy in Practice (1)

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Quantitative assessment of the production of radioactive materials by the Mevion S250i Hyperscan proton therapy system: a year-long survey
Bing-Hao Chiang, Yong Chen, George MacDurmon, Salahuddin Ahmad
Journal:

Journal of Radiotherapy in Practice / Volume 20 / Issue 3 / September 2021

Published online by Cambridge University Press:

08 July 2020, pp. 361-364
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Introduction:
This technical note describes a quantitative assessment of the production of radioactive materials during a year-long clinical operation of a Mevion S250i Hyperscan proton therapy system. The production of accumulated radioactive materials plays an important role in determining radiation safety in and around the proton therapy facilities.
Methods:
We have conducted a weekly room survey, every week for a year, during normal clinical operation.
Results and conclusions:
We estimated the accumulated activity from secondary neutron activation on aluminium structures at 3 m away from isocentre in the beamline to be less than 300 μCi.