The use of positron annihilation Doppler broadening spectroscopy in the characterization of radiochromic dosimetry films |
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| Institution: | 1. Physics Department, Faculty of Applied Medical Sciences, Taif University-Tarabah Branch, Tarabah, Saudi Arabia;2. Physics Department, Faculty of Science, Taif University, Al-Hawiah, Taif, P.O. Box 888, Zip Code 21974, Saudi Arabia;3. Physics Department, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh, Egypt;1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai, Miyagi 980-8577, Japan;2. National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;3. Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. University of Texas at Austin, Nuclear Engineering Teaching Laboratory, Pickle Research Campus, R-9000, Austin, TX 78712, USA;2. Enviroklean Product Development Inc. (EPDI), 9227 Thomasville Road, Houston, TX 77064, USA;3. Florida Memorial University, Division of Natural Sciences, Miami Gardens, FL 33054, USA;1. Institute of Chemistry, Hebrew University of Jerusalem, Givat-Ram, Jerusalem 91904, Israel;2. Institute of Physics, Maria Curie-Sklodowska University, Pl. M. Curie-Skłodowsskiej 1, 20-031 Lublin, Poland;3. I. V. Grebenshchikov Institute of the Chemistry of Silicates, Russian Academy of Sciences, Nab. Makarova, 2, Liter B, Saint-Petersburg 199034, Russia;4. Institute of Physics, Wroclaw University of Technology, W. Wyspianskiego 27, 50-370 Wroclaw, Poland |
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| Abstract: | The positron annihilation Doppler broadening (PADB) spectroscopy has been employed to probe the defects and structural changes of various types of materials. In this work, an investigation was carried out for the first time to use PADB spectroscopy in probing the γ irradiated radiochromic films. The GafChromic MD–55 and HD–V2 radiochromic films irradiated with absorbed doses ranges of 0–80 and 0–2000 Gy, respectively, were subjected to Doppler broadening measurements employing a HPGe γ–ray spectrometer. The Doppler broadening line–shape parameters (S and W) of 511 keV annihilation radiations were discussed in terms of the polymerization degree of the active components of these dosimetry films. The S- and W-parameters were found to be dependent on the active component structures of both films. A reasonable correlation was also found between the values of the S–parameter and the optical density of these radiochromic films. In addition, the Doppler broadening line–shape parameters were successfully used to provide explanation of the observed nonlinearity of these films at the end of their dynamic dose ranges. The results demonstrate the applicability of the PADB technique to probe the physical and chemical changes occurred in the active layer of the studied radiochromic films during the solid–state polymerization reaction caused by γ irradiation of different absorbed doses. |
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| Keywords: | MD-55 and HD-V2 radiochromic films Positron annihilation Doppler broadening spectroscopy Optical density γ irradiation |
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