Effect of post-irradiation thermal treatments on the stability of gamma-irradiated glass dosimeter |
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| Institution: | 1. Laboratoire de Radiotraitement, Centre National des Sciences et Technologie Nucléaires, 2020 Sidi-Thabet, Tunisia;2. Departement of Radiation Safety, Institute of Isotopes, Hungarian Academy of Sciences, Konkoly Thege Miklós út 29-33, 1121 Budapest, Hungary;3. Département de Physique, Laboratoire de Physique et Chimie des Interfaces, Faculté des Sciences de Monastir, 5000 Monastir, Tunisia;1. Hungarian Academy of Sciences, Institute of Isotopes, Budapest, Hungary;2. Hungarian Academy of Sciences, Institute of Isotopes, Budapest, Hungary;1. Radiation Laboratory, Institute of Industrial Ecology, UB RAS, 20 Sofia Kovalevskay Str., 620990 Ekaterinburg, Russia;2. Department of Experimental Physics, Ural Federal University, Ekaterinburg, Russia;1. Physics Department, McDaniel College, Westminster, MD 21157, USA;2. Institute of Nuclear Sciences, Ankara University, 06100 Besevler, Ankara, Turkey;3. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Department of Chemistry, University of Missouri – Columbia, Columbia, MO 65211, USA;2. Pacific Northwest National Laboratory, 902 Battelle Blvd, PO Box 999, Richland, WA 99352, USA;1. Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Haim Levanon St., Ramat-Aviv, Tel-Aviv 69978, Israel;2. Physics Department, McDaniel College, Westminster, MD21157, USA |
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| Abstract: | A commercial window glass has been investigated as a routine high dose dosimeter for gamma irradiation. The irradiated samples showed rapid fading at room temperature immediately after irradiation. This short-term rapid fading was followed by a slow fading at long-term. This strong initial fading is a problem for dosimetry purposes. However, when the dosimeter is measured at the same time interval after irradiation, it maintains proportionality to dose. Calibration curves have to be used for different time intervals after irradiation. In order to improve post-irradiation stability dosimeters were submitted to different post-irradiation thermal treatments from (−20) up to 150 °C. After that, optical absorbance measurements were carried out up to 2 months at room temperature. The heating at 150 °C for 20 min was found to be the most suitable procedure for the removal of unstable entities responsible for the initial rapid fading. Due to these heat treatments, variation of response was found almost negligible 24 h after irradiation for several months. Calibration curves demonstrated the applicability of this glass as routine dosimeter in the dose range of 0.5–90 kGy. |
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