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Menon SN, Singh AK, Kadam S, Mhatre S, Sanyal B, Dhabekar B. Dosimetric characterization of LiMgPO 4:Tb,B phosphor for its application in food irradiation. J FOOD PROCESS PRES 2019. [DOI: 10.1111/jfpp.13891] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. N. Menon
- Radiological Physics and Advisory Division Bhabha Atomic Research Centre Mumbai India
| | - A. K. Singh
- Radiological Physics and Advisory Division Bhabha Atomic Research Centre Mumbai India
| | - Sonal Kadam
- Radiological Physics and Advisory Division Bhabha Atomic Research Centre Mumbai India
| | - S. Mhatre
- Radiation Safety Systems Division Bhabha Atomic Research Centre Mumbai India
- Homi Bhabha National Institute Mumbai India
| | - Bhaskar Sanyal
- Food Technology Division Bhabha Atomic Research Centre Mumbai India
- Homi Bhabha National Institute Mumbai India
| | - Bhushan Dhabekar
- Radiological Physics and Advisory Division Bhabha Atomic Research Centre Mumbai India
- Homi Bhabha National Institute Mumbai India
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Soliman YS, Abdel-Fattah AA, Alkhuraiji TS. Radiochromic film containing poly(hexa-2,4-diynylene adipate) as a radiation dosimeter. Appl Radiat Isot 2018; 141:80-87. [PMID: 30195104 DOI: 10.1016/j.apradiso.2018.08.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 08/19/2018] [Accepted: 08/19/2018] [Indexed: 11/30/2022]
Abstract
A radiation-sensitive polymer poly(hexa-2,4-diynylene adipate) (PHDA) was synthesized and incorporated into polyvinyl butyral films for radiation dose measurements in the 0.5 - 60 kGy range. PHDA undergoes crosslinking polymerization upon exposure to γ-rays, which changes its color from very pale yellow to deep orange-yellow. The color change is directly related to the absorbed dose. The absorption spectrum of the irradiated films features one absorption band around 500 nm with a shoulder around 465 nm. With increasing absorbed dose, the two bands grow in intensity and move towards higher wavelengths. The dosimeter is nearly insensitive to variations of the humidity in the range of 0-54% and temperature in the range of 30-45 °C during irradiation. The color intensifies after irradiation, both in the dark and in the light at room temperature, which reflects the continuing crosslinking polymerization. However, at - 4 °C, the color intensity does not change with time.
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Affiliation(s)
- Yasser S Soliman
- National Center for Radiation Research and Technology, Atomic Energy Authority, P.O. box 8029 Nasr City, Cairo, Egypt.
| | - Atef A Abdel-Fattah
- National Center for Radiation Research and Technology, Atomic Energy Authority, P.O. box 8029 Nasr City, Cairo, Egypt
| | - Turki S Alkhuraiji
- King Abdulaziz City for Science and Technology, National Center for Irradiation Technology, Riyadh, Saudi Arabia
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Bouhier M, Vigneron G, Ngono-Ravache Y, Shirdhonkar M, Renault JP, Le Caër S. In situ and time-resolved infrared detection of the reactivity induced by electrons in polymer films. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:034102. [PMID: 28372418 DOI: 10.1063/1.4978442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The real time and in situ analysis of chemical reactions such as polymerization reactions, polymer degradation, and oxidation of polymers is of utmost importance. Surprisingly, only few experimental tools allowing this are available. To bridge this gap, we have developed a new experimental setup coupling a 60 keV electron gun with an infrared spectrometer operating in the mid-IR region (800-4000 cm-1) and associated with the rapid scan mode. The measurements are performed using the infrared reflection absorption spectroscopy approach. We worked here with 0.5-25 ms pulses for which the dose per pulse ranges from 4 to 200 kGy. Combining pulse electrons with rapid scan analysis enables performing experiments with a time resolution of 80 ms (and above). Therefore, this new platform can, for instance, give direct insights into reaction mechanisms at stake during the degradation of polymers. First results on a bisphenol A polycarbonate irradiated under vacuum enabling the validation of this new setup and also the recording of time-resolved spectra are presented. Reaction mechanisms are then proposed.
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Affiliation(s)
- M Bouhier
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - G Vigneron
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - Y Ngono-Ravache
- DRF/IRAMIS/CIMAP, UMR 6252, BP 5133, F-14070 Caen Cedex 5, France
| | - M Shirdhonkar
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - J P Renault
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - S Le Caër
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
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Mohammadyari P, Zehtabian M, Sina S, Tavasoli AR, Faghihi R. Dosimetry of gamma chamber blood irradiator using PAGAT gel dosimeter and Monte Carlo simulations. J Appl Clin Med Phys 2014; 15:3952. [PMID: 24423829 PMCID: PMC5711240 DOI: 10.1120/jacmp.v15i1.3952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 06/27/2013] [Accepted: 08/12/2013] [Indexed: 11/24/2022] Open
Abstract
Currently, the use of blood irradiation for inactivating pathogenic microbes in infected blood products and preventing graft‐versus‐host disease (GVHD) in immune suppressed patients is greater than ever before. In these systems, dose distribution and uniformity are two important concepts that should be checked. In this study, dosimetry of the gamma chamber blood irradiator model Gammacell 3000 Elan was performed by several dosimeter methods including thermoluminescence dosimeters (TLD), PAGAT gel dosimetry, and Monte Carlo simulations using MCNP4C code. The gel dosimeter was put inside a glass phantom and the TL dosimeters were placed on its surface, and the phantom was then irradiated for 5 min and 27 sec. The dose values at each point inside the vials were obtained from the magnetic resonance imaging of the phantom. For Monte Carlo simulations, all components of the irradiator were simulated and the dose values in a fine cubical lattice were calculated using tally F6. This study shows that PAGAT gel dosimetry results are in close agreement with the results of TL dosimetry, Monte Carlo simulations, and the results given by the vendor, and the percentage difference between the different methods is less than 4% at different points inside the phantom. According to the results obtained in this study, PAGAT gel dosimetry is a reliable method for dosimetry of the blood irradiator. The major advantage of this kind of dosimetry is that it is capable of 3D dose calculation. PACS number: 87.53.Bn
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Koulouklidis AD, Cohen S, Kalef-Ezra J. Thermochromic phase-transitions of GafChromic films studied by z
-scan and temperature-dependent absorbance measurements. Med Phys 2013; 40:112701. [DOI: 10.1118/1.4823761] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Odgers D, Haque M. Near-catheter dosimetry of a HDR brachytherapy source using Gafchromic film. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2013; 36:159-66. [DOI: 10.1007/s13246-013-0186-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 02/18/2013] [Indexed: 10/27/2022]
Affiliation(s)
- David Odgers
- Institute of Medical Physics, School of Physics, University of Sydney, Australia.
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Chilkulwar R, Sharma S, Chaudhary N, Acharya S, Mayya Y, Mittal K, Gantayet L. Dosimetric evaluation of an indigenously developed 10 MeV industrial electron beam irradiator. RADIAT MEAS 2012. [DOI: 10.1016/j.radmeas.2012.06.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dosimetry of gamma chamber blood irradiator using Gafchromic EBT film. Appl Radiat Isot 2010; 69:130-5. [PMID: 20850330 DOI: 10.1016/j.apradiso.2010.08.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 06/15/2010] [Accepted: 08/25/2010] [Indexed: 11/22/2022]
Abstract
Gafchromic films are increasingly being used for dosimetry in medical and industrial applications of ionizing radiation because of their favorable characteristics such as self developing in nature, easy to handle, dose rate independent response, insensitivity to normal room lights, high resolution and insensitivity to variation in the environment conditions. The dosimetry measurements using Gafchromic EBT film, Fricke dosimeter and thermoluminescence (TL) dosimeter were carried out on gamma blood irradiators to establish the suitability of Gafchromic EBT film in such applications. The dose rates determined by Gafchromic EBT film, Fricke dosimeter and TL dosimeter powder are found in good agreement to one another within the uncertainty of measurement. The two-dimensional dose distributions determined using Gafchromic EBT film reflects the expected dose distribution inside the sample compartment of the blood irradiator. The results of this study establish Gafchromic EBT film a suitable dosimeter for routine dosimetry on gamma blood irradiators.
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