Effect of gamma-irradiation on the colorimetric properties of epoxy-resin films: Potential use in dosimetric application (original) (raw)
Related papers
2004
The influence of y-rays on the optical absorption and inelastic scattering, dielectric properties and conductivity of radiation-sensitive dyed polyvinyl alcohol (TBIPVA) film dosimeters containing chloral hydrate and acid-sensitive Thymol blue dye were evaluated for possible use as food irradiation indicators. The dyed PVA films of different concentrations of chloral hydrate were irradiated with the absorbed doses ranging up to 12 kGy using y-rays from Cobalt-60. The dehydrochlorination of chloral hydrate and radiolysis of water molecules induced by ionising radiations accelerated the formation of hydrochloric acid in the polymer matrix, which caused the change in colour of the dosimeters from yellow to red at the critical doses depending on the concentration of chloral hydrate. This radiation-induced colour change was analysed using UV-Vis spectrometer, where the absorption spectra produced two visible maximal bands, peaking at 445 nm and 554 nm. The dose response at 445 nm and 554...
Radiation-induced color bleaching of methyl red in polyvinyl butyral film dosimeter
Radiation Physics and Chemistry, 2011
Radio-chromic film based on polyvinyl butyral (PVB) containing different concentrations of methyl red (MR) dye for 0.125, 0.25 and 0.5 mM has been introduced as high dose dosimeter. The dosimeters were irradiated with gamma ray from 60 Co source at doses from 5 to 150 kGy. UV/vis spectrophotometry was used to investigate the optical density of unirradiated and irradiated films in terms of absorbance at 497 nm. The dose sensitivity of MR-PVB film dosimeter increases strongly with increase of absorbed dose as well as increase of concentrations of MR dye. The effects of irradiation temperature, relative humidity, dose rate and the stability of the response of the films after irradiation were investigated and found that these films could be used as routine dosimeter in industrial radiation processing. The useful dose range of developed MR-PVB film dosimeters is in the range of 5-100 kGy.
Effect of Gamma Radiation on a Mixed Dye Film and Its Possible Use as a Radiation Dosimeter
European Chemical Bulletin
Dyed poly(vinyl alcohol) (PVA) films prepared by a simple technique of casting aqueous PVA solution incorporating a mixture of two dyes namely chlorophenol red (CPR) and Quinaldine Red (QR) on a horizontal glass plate are useful as high dose dosimeter in the dose range 2-30 kGy range. The colour of these films change from deep red to yellow when exposed to gamma radiation. Chloral hydrate was added with different concentrations. The response of the prepared films can be modified either by change of chloral hydrate concentration or ratio of the two dyes. As a result, these films can be used as a dosimeter in two dose ranges. The dosimetric parameters, e.g.; dose response, effect of relative humidity on response as well as pre-and post-irradiation stability of these films have been investigated.
Polymers
This study investigated the polymer film composite of polyvinyl alcohol (PVA), trichlorethylene (TCE) and cresol red (CR) dye irradiated with gamma (γ) rays for potential application as radiation dosimetry. The film was prepared via the solvent-casting method with varying concentrations of TCE. Film samples were exposed to radiation from a γ-rays radiation source of 60Cobalt isotope. Color changes before and after γ-rays irradiation were observed, and the optical properties of the polymer films were investigated by spectrophotometry. Results show that increasing the radiation dose physically changed the color of the polymer film, from purple (pH > 8.8) without radiation (0 kGy) to yellow (almost transparent) (2.8 < pH < 7.2) at the highest dose (12 kGy). The concentration of acid formed due to irradiation increased with the increase in irradiation doses and at higher TCE content. The critical doses of PVA-TCE composites decreased linearly with the increase of TCE compositio...
Effect of high gamma irradiation doses on structure and morphology properties for Epoxy resins
Optik, 2021
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Journal of Physics: Conference Series, 2019
This research is aimed to introduce and to compare 3 methods of reading out and analyzing light blue radiochromic film (BLF) dosimeter and red radiation-sensitive poly-methylmethacrylate (PMMA). The BLF and red radiation-sensitive PMMA act as a colour detector which its colour changes after being irradiated. These dosimeters are usually used in food irradiation for process control during irradiation process. The camera-based measurement in a constraint condition, scanner-based measurement with the Trichromatic Colour Analyser (TCA) software and spectrophotometer were used for obtaining colorimetric data of both dosimeters which were non-irradiated and irradiated in 5 doses: 5, 10, 15, 20 and 25 kGy. There were strong linear relationships between doses, given to BLF, and lightness (CIE L*), chroma (CIE C*) and yellowness-blueness (CIE b*) for 3 methods. For red radiation-sensitive PMMA, strong linear relationships were found between doses and redness-greenness (CIE a*) as well as CIE...
Dyed polyvinyl chloride films for use as high-dose routine dosimeters in radiation processing
Radiation Physics and Chemistry, 2004
Characteristics of the polyvinyl chloride (PVC) films containing 0.11 wt% of malachite green oxalate or 6GXsetoglausine and about 100 mm in thickness were studied for use as routine dosimeters in radiation processing. These films show basically color bleaching under irradiation with 60 Co g-rays in a dose range of 5-50 kGy. The sensitivity of the dosimeters and the linearity of dose-response curves are improved by adding 2.5% of chloral hydrate [CCl 3 CH(OH) 2 ] and 0.15% hydroquinone [HOC 6 H 4 OH]. These additions extend the minimum dose limit to 1 kGy covering dosimetry requirements of the quality assurance in radiation processing of food and healthcare products. The dose responses of both dyed PVC films at irradiation temperatures from 20 C to 35 C are constant relative to those at 25 C, and the temperature coefficients for irradiation temperatures from 35 C to 55 C were estimated to be (0.4370.01)%/ C. The dosimeter characteristics are stable within 1% at 25 C before and 60 days after the end of irradiation. r
To Determine Dose Response Curves of Dyed Polyvinyl Alcohol Films Irradiated with Gamma-Rays
Open Journal of Safety Science and Technology, 2018
The Polyvinyl Alcohol (PVA) films dyed with different colors such as methylene blue (MB), methyl orange (MO), methyl red (MR) and crystal violet (CV) were investigated. The dyed PVA films were irradiated by with Co 60 γ-source in dose range of 1-150 kGy. The optical density change in these films at pre and post irradiation was studied by spectrophotometer. The gamma dose response curves of the dyed PVA films were described by saturated exponential function of the energy transfer model with high correlative coefficient. The color sensitivities on the dyed PVA films irradiated by source were different. The PVA films dyed with MB had the highest sensitivity.
Journal of Nuclear Physics, Material Sciences, Radiation and Applications, 2020
This work aims to evaluate a dosimetric system composed of green malachite supported in agarose. Previous work showed that solutions of green malachite irradiated at 1 to 40 kGy present a linear behavior. This system is a gel composed of green malachite (2.5×10–3 M), sodium benzoate (1%),and agarose (1%) that was exposed tovarious doses of gamma irradiation. The irradiated systems were measured with a UV-V is spectrophotometer at 619 nm. Experimental parameters (such as dose rate, doses, and temperature) were controlled and optimized for reproducible and reliable results. More studies are needed to propose a dosimeter in the system in the range of 1.8 to 4.0 kGy.
2010
In this work we studied the effects of exposure to gamma radiation on two type epoxy resins: diglycidylether of bisphenol A (DGEBA) and diglycidyether 4,4 'dihydroxydiphenyl sulfone (DGEDDS) crosslinked with methylenedianiline (MDA) and 1,2-phenylenediamine (PDA). These resins were synthesized by condensing mass of the diol with epichlorohydrin in a basic medium. IRTF spectrometry and H NMR was used to identify their structures before crosslinking. Then we followed the aging ATG by X microanalysis also allowed us to highlight the phenomenon of oxidation of the surface observed by SEM photos. Knowledge of the glass transition temperature and the starting temperature of degradation indicates a correlation between thermal stability and structure. The improvement of thermal properties could be a key issue to ensure structural stability of a matrix and therefore a better resistance to radiation.