Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix

El-Said, H.; Ramadan, H. E.; Elmaghraby, Elsayed K.; Amin, Mohamed A.

doi:10.1515/ract-2017-2885

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…The efficiency calibration was done using standard sources with uncertainty less than 7%. The efficiency of the germanium detector was calibrated using decay from standard sources of 60 Co (Browne and Tuli, 2013), 133 Ba (Khazov, 2011), 137 Cs (Browne and Tuli, 2007) and 152,154 Eu (Martin, 2013;El-Said et al, 2018).…”

Section: Measurement Techniquesmentioning

confidence: 99%

Correspondence and difference between gamma-ray and neutron irradiation effects on organic materials in marine environment

Elmaghraby¹,

Abdelaal²,

Abdelhady³

et al. 2019

Egypt. J. of Aquatic Biolo. and Fish.

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This work is devoted to understand the difference between gamma ray effects and neutron influence on organic materials in order to interpret the change occurred in organic matter that coexists with nuclear tests in deep marine environment. A combination of Fourier-transform infrared spectroscopy (FTIR) and a simple statistical analysis was applied as a tool for the quantitative determination of changes in chemical properties due to radiation effects. The primary goal of this work was to statistically deduce, from correlations obtained between different band intensities, more information on the changes occurred. It did not aim only to investigate in detail the PolyAllyl Diglycol Carbonate (PADC) structure due to gamma and neutron irradiation impacts. The PADC samples obtained from Track Analysis System Ltd., UK of TASTRAK type were irradiated with gamma-ray dose in the range from (5±1)×10 3 Gy to (3.0±0.6)×10 6 Gy using 60 Co standard gamma cell of calibrated dose rate. While a high neutron fluence from ETRR-2 research reactor was applied for neutron irradiation process. The results showed a shift in absorption intensities for various bands due to either gamma or neutron irradiation. Such bands are the C=O, C=C and CO -C. Moreover, formation of-OH radical was observed which indicating water content in the studied samples after irradiation. Such induced alterations were due to bond breakage of weak bonds such as, C-H, CO , and CC with different possibilities for gamma irradiation effects. While for neutron irradiation, atomic displacement in the material was the main reason for such changes. Furthermore, by applying a simple statistical analysis test, major infrared bands were integrated in order to make sense of, and draw correlations between each other to get more accurate and comparable results. The obtained results showed a good correlation between some bands, while the other didn't. Also, the applied correlations simplified the comparison between gamma ray and neutron induced effects.

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Section: Measurement Techniquesmentioning

confidence: 99%

Correspondence and difference between gamma-ray and neutron irradiation effects on organic materials in marine environment

Elmaghraby¹,

Abdelaal²,

Abdelhady³

et al. 2019

Egypt. J. of Aquatic Biolo. and Fish.

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“…Uncertainty in efficiency calibration depends on the sample shape; for Cs samples, point sources uncertainties were between 4% and 5%; for larger samples; the accumulated uncertainty of the efficiency calibration was about 7%-10% [24,35]. Time uncertainty is a crucial factor for short lived isotopes; including less than 1% in irradiation time.…”

Section: Uncertaintiesmentioning

confidence: 99%

Role of isomeric state formation on the measurement of thermal neutron cross section and resonance integral

Elmaghraby¹,

Salem²,

Yousef³

et al. 2018

Phys. Scr.

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The isomeric thermal neutron cross section and isomeric resonance integral of 109 Ag(n, γ) 110m Ag, 133 Cs(n, γ) 134m Cs and 134g Cs, and 136 Ba(n, γ) 137m Ba reactions were investigated together with 115 In(n, γ) 116m In monitor reaction. These residual nuclei have broad half-life time scale suitable for our investigation. Moderated neutrons from steady AmBe source were used for activation of samples with natural abundances. Field was monitored and mapped using gold and indium activation. The formulae used for neutron activation analysis were derived with emphasizing the different interpenetrations of cadmium transmission factor and self-shielding factors. The k 0 -factor for γ-rays in the residual nuclei were measured. The isomeric thermal neutron cross section and resonance integral for 115 In(n, γ) 116m In were evaluated to be 162.6 b and 2585 b. These data were used to measure the k 0 -factors; and compared to reported values to confirm the procedure. The thermal neutron cross section and resonance integral for 133 Cs(n, γ) 134m Cs were found to be 2.64±0.11 b and 42±1.7 b, respectively; while those of the 109 Ag(n, γ) 110m Ag reaction were 4.09±0.35 b and 68±6 b. Thermal neutron cross section for 136 Ba(n, γ) 137m Ba was identified as 0.032±0.003 b, while the resonance integral could not be evaluated as a result of interfering reactions. Model calculations were done using EMPIRE code to simulate isomeric ratio and compared with the experimental results. The feeding of isomeric state from neutron reaction is more sensitive to the variation of neutron flux distribution than the nucleus formation. Steady neutron field could be retained with isotopic neutron source with moderation setup and geometry of suitable homogeneity and isotropy.

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Retention behavior of cesium radioisotope on poly (acrylamido-sulfonic acid) synthesized by chain polymerization

Hassan

Elmaghraby

2019

Applied Radiation and Isotopes

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Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix

Cited by 11 publications

References 15 publications

Correspondence and difference between gamma-ray and neutron irradiation effects on organic materials in marine environment

Correspondence and difference between gamma-ray and neutron irradiation effects on organic materials in marine environment

Role of isomeric state formation on the measurement of thermal neutron cross section and resonance integral

Retention behavior of cesium radioisotope on poly (acrylamido-sulfonic acid) synthesized by chain polymerization

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