Radiation induced degradation of murexide dye in two media for possible use in dosimetric applications

2019 ◽  
Vol 48 (6) ◽  
pp. 540-546 ◽  
Author(s):  
Sameh Mohamed Gafar ◽  
Nehad Magdy Abdel-Kader
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Chemical Yield ◽  
Radiation Sensitivity ◽  
Industrial Applications ◽  
Food Irradiation ◽  
Radiation Chemical ◽  
Content Type ◽  
Wide Range

Purpose The purpose of this paper is to study the effect of gamma-rays on murexide (Mx) dye and its possible use as radiation dosimeters in two different dosimetry systems. The first system depends on the Mx dye as a liquid dosimeter. The second dosimetry system depends also on the same dye but as in a gel form, which is more sensitive to gamma-rays. Design/methodology/approach The prepared Mx (solutions/gels) have a considerable two peaks at 324 and 521 nm that upon irradiation, the intensity of these peaks decreases with the increasing radiation dose. Findings The gamma-ray absorbed dose for these dosimeters was found to be up to 2 kGy for the solution samples and 40 Gy for the gels. Radiation chemical yield, dose response function, radiation sensitivity and before and after-irradiation stability under various conditions were discussed and studied. Practical implications It is expected that the radiolysis of the Mx dye can be used as radiation dosimeters in two different dosimetry systems; liquid and gel dosimeters. This can be applied in a wide range of gamma radiation practical industrial applications in water treatment, food irradiation dosimeters, radiotherapy and fresh food irradiation and seed production. Originality/value Both of the prepared Mx dyes, either as solutions or gel samples, can be facilely prepared from commercially, cheap, safe, available chemicals and suitable for useful applied Mx solutions and gels radiation dosimeters.

Development of two dosimetry systems based on basic violet dye for possible use as radiation dosimeters

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nehad Magdy ◽  
Sameh Gafar
Keyword(s):  
Gamma Ray ◽  
Raw Materials ◽  
Absorbed Dose ◽  
Chemical Yield ◽  
Radiation Sensitivity ◽  
Vital Role ◽  
Radiation Chemical ◽  
Content Type ◽  
Before And After

Purpose The purpose of this research paper is to study a comparison between two dosimetry systems, both of them based on basic violet dye (BV). Design/methodology/approach The first system depends on (BV) (incorporating polyvinyl alcohol) as a thin-film dosimeter. The second system also relies on (BV) as a solution dosimeter, which is more sensitive to gamma rays. The two prepared film/solutions have a considerable signal that decreases upon irradiation and the strength of the signal decreases with increasing radiation dose. Findings The gamma ray absorbed dose for these dosimeters was found to be up to 35 kGy for films and 1 kGy for the liquid phase. All dosimetric characteristics as radiation chemical yield, additive substance, dose-response function, radiation sensitivity, also before and after-irradiation stability under various conditions were considered. Practical implications It is expected the vital role of gamma radiation on this dye in its two forms or two media. This reveals their wide applications in the field of gamma irradiation processing. Originality/value These two dosimetry systems which depend upon the same dye are safe to handle, inexpensive, available raw materials and can be applied in various dosimetry applications as mentioned above.

Dosimetric characteristics and applications of cross-linking and degradation of a natural biopolymer Gum Acacia

2020 ◽  
Vol 108 (3) ◽  
pp. 223-229
Author(s):  
Sameh M. Gafar ◽  
Nehad M. Abdel-Kader
Keyword(s):  
Gamma Rays ◽  
Gum Arabic ◽  
Chemical Yield ◽  
Radiation Sensitivity ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Radiation Chemical ◽  
Gum Acacia ◽  
Wide Range ◽  
G Value

AbstractThe current study covers the effect of gamma rays on a natural biopolymer Gum Arabic (GA). Gum acacia has a very wide range applications in various fields, that a comparison between two dosimetry systems; the first system depends on the radiolysis of GA (mixing poly-vinyl alcohol) as a thin-film dosimeter. The second system depends on the same material GA as solutions dosimeter, which is more sensitive to γ-radiation due to free mobility of free radicals released by the action of gamma rays. The prepared GA/film/solutions have a considerable peak at 289 nm, which increases (cross-linking of GA polymer) upon irradiation until 28 and 6 kGy for two systems, respectively in case of the first step. However, upon increased the absorbed doses and the intensity of the signal decrease with increasing radiation dose (degradation of GA polymer) up to 80 and 15 kGy for film and solutions. Radiation chemical yield G-(value); dose-response function; gamma radiation sensitivity; also pre- and post-irradiation stability under various conditions were illustrated.

scholarly journals Development of two dosimeters for industrial use with low doses

2017 ◽  
Vol 32 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Moshira El-Kelany ◽  
Sameh Gafar
Keyword(s):  
Thin Film ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Chemical Yield ◽  
Radiation Sensitivity ◽  
Liquid Form ◽  
Radiation Chemical ◽  
Before And After ◽  
Industrial Use ◽  
Dose Response Function

The present study involves a comparison between two dosimetry systems. The first system depends on victoria blue B (incorporating polyvinyl alcohol) as a thin-film dosimeter. The second system depends on the same dye as a liquid dosimeter, which is more sensitive to gamma rays. The prepared film/liquid has a considerable signal that increases upon irradiation and the intensity of the signal decrease with increasing radiation dose. The gamma ray absorbed dose for these dosimeters was found to be up to 25 kGy for the thin film and 700 Gy for the liquid form. Radiation chemical yield, additive substance, dose response function, radiation sensitivity, also before and after-irradiation stability under various conditions were discussed and studied.

scholarly journals Radiation chemical yield for loss of carbonate ester bonds in PADC films exposed to gamma ray

2009 ◽  
Vol 44 (2) ◽  
pp. 211-213 ◽  
Author(s):  
Yutaka Mori ◽  
Toshiji Ikeda ◽  
Tomoya Yamauchi ◽  
Atsushi Sakamoto ◽  
Hiraku Chikada ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Chemical Yield ◽  
Radiation Chemical Yield ◽  
Radiation Chemical

scholarly journals Gamma-Ray Burst Observations with BATSE

1998 ◽  
Vol 188 ◽  
pp. 159-162
Author(s):  
Gerald J. Fishman
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Gamma Ray Burst ◽  
New Era ◽  
X Ray ◽  
Time Profiles ◽  
Random Direction ◽  
Wide Range ◽  
New Phenomena

Gamma-ray bursts (GRBs) will be recorded as one of the outstanding new phenomena discovered in astronomy this century. About once per day, a burst of gamma rays appears from a random direction on the sky. Often, the burst outshines all other sources of gamma-rays in the sky, combined. This paper reviews some of the key observed phenomenon of bursts in the hard x-ray/gamma-ray region, as observed with the BATSE experiment on the Compton Gamma Ray Observatory. The observed time profiles, spectral properties and durations of gamma-ray bursts cover a wide range. Recent breakthroughs in the observation of gamma-ray burst counterparts and afterglows in other wavelength regions have marked the beginning of a new era in gamma-ray burst research. Those observations are described in following papers in these proceedings.

Dosimetric evaluation of methyl red radiochromic film for radiation processing

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Awad AL Zahrany ◽  
Khalid Rabaeh ◽  
Molham Eyadeh ◽  
Ahmed Basfar
Keyword(s):  
Gamma Ray ◽  
Dose Range ◽  
Absorbed Dose ◽  
Radiochromic Film ◽  
High Dose ◽  
Methyl Red ◽  
Radiation Processing ◽  
Content Type ◽  
The Stability ◽  
The Impact

Purpose The purpose of this paper is to present a radiochromic film dosimeter containing polyvinyl alcohol (PVA) matrix and various concentrations of methyl red (MR) dye for high dose measurements. Design/methodology/approach The MR-PVA films were exposed to irradiation up to 60 kGy using 60Co source of gamma ray. The ultraviolet and visible regions (UV/VIS) spectrophotometry were used to examine the optical density of pre-and post-irradiated dosimeters at 424 nm. Findings The dose sensitivity of MR-PVA films increases significantly with increasing MR dye concentrations in the dose range of 5 to 60 kGy. The impact of relative humidity, irradiation temperature, dose rate and the stability of the films has been analyzed. The overall uncertainty of the MR-PVA film dosimeter is 6.12% (Double Standard-deviation, 95% confidence level). Practical implications It was found that the MR-PVA films may be used as high dose dosimeter with an acceptable overall uncertainty in routine industrial radiation processing. Originality/value The color bleaching of irradiated MR-PVA films in terms of specific absorbance curves increases significantly with increasing absorbed dose up to 60 kGy.

scholarly journals Effect of Addition of Soybean Oil and Gamma-Ray Cross-linking on the Nanoporous HDPE Membrane

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Jong-Seok Park ◽  
Jong-Bae Choi ◽  
Hui-Jeong Gwon ◽  
Youn-Mook Lim ◽  
Myung Seob Khil ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Soybean Oil ◽  
Gamma Rays ◽  
High Density Polyethylene ◽  
Dibutyl Phthalate ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Electrochemical Stability ◽  
Cross Linking ◽  
Wet Process

A nanoporous high-density polyethylene (HDPE) membrane was prepared by a wet process. Soybean oil and dibutyl phthalate (DBP) were premixed as codiluents, and gamma-rays were used for the cross-linking of HDPE. The pore volume of the nanoporous HDPE membranes with soybean oil was affected by the extracted amount of oil. The tensile strength of the membrane improved with an increasing absorbed dose up to 60 kGy, but decreased at 80 kGy due to severe degradation. The ionic conductivity of the nanoporous HDPE membrane did not really change with an increasing absorbed dose because the pores had already been formed before the gamma-ray radiation. Finally, the electrochemical stability of the HDPE membrane increased when the absorbed dose increased up to 60 kGy.

ВЛИЯНИЕ ПРЕДВАРИТЕЛЬНОГО ОБЛУЧЕНИЯ ГАММА-КВАНТАМИ НА ОДИНОЧНЫЕ СБОИ В МИКРОСХЕМАХ ПАМЯТИ, ВОЗНИКАЮЩИЕ ПРИ ВОЗДЕЙСТВИИ НЕЙТРОНОВ ЭНЕРГИИ 14 МЭВ

2020 ◽  
Vol 96 (3s) ◽  
pp. 187-189
Author(s):  
В.П. Шукайло ◽  
О.В. Ткачев ◽  
А.С. Кустов ◽  
К.Д. Какшарова
Keyword(s):  
Dose Level ◽  
Cross Section ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Single Event ◽  
Single Event Upsets ◽  
Dielectric Layers ◽  
Gamma Ray Irradiation ◽  
Preliminary Irradiation

Исследовано влияние предварительного облучения гамма-квантами на сечение одиночных событий (ОС) в СОЗУ при воздействии нейтронов с энергией 14 МэВ. Показано, что с увеличением уровня предварительного облучения гамма-квантами сечение ОС возрастает. Рост сечения от величины поглощенной дозы обусловлен накоплением зарядов в диэлектрических слоях интегральной микросхемы. The paper explores the influence of a preliminary gamma ray irradiation on single event upsets (SEU) in SRAM at 14 MeV neutrons influence. It has been shown that there is an increase in SEU cross section with an increase of level of preliminary irradiation by gamma rays. The increase of cross section from absorbed dose level depends on accumulation of charges in dielectric layers of integrated microcircuit.

Degradation of Acetaminophen in Aqueous Media by H2O2 Assisted Gamma Irradiation Process

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Murtaza Sayed ◽  
Fazal Hadi ◽  
Javed Ali Khan ◽  
Noor S. Shah ◽  
Luqman Ali Shah ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Absorbed Dose ◽  
Degradation Process ◽  
Chemical Yield ◽  
Spectrophotometric Analysis ◽  
Γ Irradiation ◽  
Solution Ph ◽  
Radiation Chemical ◽  
G Value

Abstract In the present study, degradation of acetaminophen (ACT) aqueous solution was investigated up to an absorbed γ-irradiation dose of 1000 Gy. The effects of various additives on the degradation efficiency of ACT were also studied. The results showed that ACT degradation was increased with the increase of an absorbed dose. Based on spectrophotometric analysis, 82.5% degradation of the initial ACT concentration (9.98×10−5 M) was easily achieved at an absorbed dose of 1000 Gy. The decay of ACT followed pseudo-first order reaction kinetics at different initial concentrations. The radiation chemical yield (G-value) decreased with the increase of an absorbed dose, however at a specific absorbed dose G-values increased with the increase of ACT initial concentration. The addition of H2O2 in the range of 0.1–0.7% was effective for degradation of ACT. The degradation of ACT was inhibited in both acidic and basic solutions while maximium degradation effiency was acheived at nearly neautral solution pH, 7.6. The degradation process was markedly enhanced under oxidative conditions while strongly restrained under reductive conditions, which suggests the key role of oxidative radicals (˙OH) in the degradation of ACT.

A novel 3D shape reconstruction method based on maximum correntropy Kalman filtering

Sensor Review ◽  
2019 ◽  
Vol 39 (3) ◽  
pp. 332-340 ◽  
Author(s):  
Man Chen ◽  
Yong Zhong ◽  
Zhendong Li ◽  
Jin Wu
Keyword(s):  
Kalman Filtering ◽  
Industrial Applications ◽  
Shape Reconstruction ◽  
Reconstruction Method ◽  
Content Type ◽  
Spatial Continuity ◽  
3D Shape Reconstruction ◽  
Wide Range ◽  
Shape From Focus ◽  
Better Than

Purpose This paper aims to investigate a novel shape from focus (SFF) algorithm based on maximum correntropy Kalman filtering (SFF-MCKF) for solving the problem that traditional SFF methods are weak in de-noising and spatial continuity. Design/methodology/approach To be specific, it was first assumed that the predicted depth of next pixel is equal to the depth of the current pixel according to spatial continuity. Besides, the observing data are derived from the estimation of traditional SFF and the corresponding covariance of noise is adaptively calculated by the entropy along the optical axis. Finally, to enhance robustness, we systematically conduct MCKF iteratively in four transfer directions that are 0°, 90°, 45° and −45°, respectively. Findings The experimental results indicate that the robustness of SFF-MCKF facing noises as well as the spatial continuity is better than that of the existing representative ones. Research limitations/implications As the proposed method is aimed at precision objects, high demand is for experimental device. Unstable device unregister the source images, which is unfavorable for observing data. Originality/value SFF-MCKF can be applied to many precision object measurements without significant drifts, such as the surface reconstruction of metal objects and electronic components. Besides, the computation cost is low, and SFF-MCKF has a wide range of real-time industrial applications.

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