A pilot study of a postal dosimetry system using the Fricke dosimeter for research irradiators |
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| Institution: | 1. Radiological Sciences Department, Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil;2. Physics Department, Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil;3. Department of Medical and Research Facilities, National Nuclear Energy Authority (CNEN), Rio de Janeiro, Brazil;1. Department of Medical Physics, Hospital Universitario Ramón y Cajal, Madrid, Spain;2. Biomedical Engineering, ETSIT, Universidad Politécnica de Madrid, Madrid, Spain;3. Medical Physics, Department of Radiology, Rehabilitation and Physiotherapy, Universidad Complutense de Madrid, Madrid, Spain;1. Fondazione Policlinico Universitario ‘‘A. Gemelli’’ IRCCS, Roma, Italy;2. Università Cattolica del Sacro Cuore, Rome, Italy;1. Department of Medical Physics – Oncology, Aarhus University Hospital, Aarhus, Denmark;2. Faculty of Informatics & Science, University of Oradea, Oradea, Romania;3. Cancer Research Institute, University of South Australia, Adelaide, Australia;4. Institut Curie, Université PSL, CNRS UMR3347, Inserm U1021, 91400 Orsay, France;5. Department of Medical Physics, Hygeia Hospital, Athens, Greece;6. Health Physics Department, University Hospital, Novara, Italy;1. Fondazione Policlinico Universitario ‘‘A. Gemelli’’ IRCCS, Italy;2. Università Cattolica del Sacro Cuore, Rome, Italy |
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| Abstract: | Cobalt-60 irradiators and soft X-ray machines are frequently used for research purposes, but the dosimetry is not always performed using the recommended protocols. This may lead to confusing and untrustworthy results within the conducted research. Postal dosimetry systems have already been approved by the IAEA, with thermoluminescence dosimeters (TLD) and optically stimulated luminescence (OSL) as the most commonly used dosimeter systems in these cases. The present study tests the Fricke dosimeter properties as a potential system to be used in postal dosimetry for a project using research irradiators. The Fricke solution was prepared according to the literature, and the linearity and fading tests were performed accordingly. All calculated doses were measured using a NE2571 Farmer ionization chamber as a reference. Doses ranging from 25 to 300 Gy were delivered by a research irradiator, with 150 kV and 22 mA to the Fricke solutions inside polyethylene (PE) bags (4 × 4 × 0.2 cm3). The results compared with the ionization chamber showed a linear response to the range of doses used. Fading tests showed no significant difference for the absorbed doses over 9 days, with a maximum difference of 1.5% found between days 0 and 3. The Fricke dosimeter presented good linearity, for low and high doses, and low uncertainties for the fading even for 9 days after irradiation. These preliminary results are motivating, and as the next step, we intend to design a postal dosimetry system using the PE bags of Fricke solution. |
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| Keywords: | Fading Fricke dosimetry X-ray irradiator RS2000 Postal dosimetry |
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