Backscattered radiation into a transmission ionization chamber
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2010
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Applied Radiation and Isotopes
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Backscattered radiation (BSR) from field-defining collimators can affect the response of a monitor chamber in X-radiation fields. This contribution must be considered since this kind of chamber is used to monitor the equipment response. In this work, the dependence of a transmission ionization chamber response on the aperture diameter of the collimators was studied experimentally and using a Monte Carlo (MC) technique. According to the results, the BSR increases the chamber response of over 4.0% in the case of a totally closed collimator and 50kV energy beam, using both techniques. The results from Monte Carlo simulation confirm the validity of the simulated geometry.
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YOSHIZUMI, MAIRA T.; YORIYAZ, HELIO; CALDAS, LINDA V.E. Backscattered radiation into a transmission ionization chamber: measurement and Monte Carlo simulation. Applied Radiation and Isotopes, v. 68, n. 4-5, p. 586-588, 2010. DOI: 10.1016/j.apradiso.2009.10.015. Disponível em: http://repositorio.ipen.br/handle/123456789/4703. Acesso em: 28 Mar 2025.
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