Guide for Selection and Use of Mathematical Methods for Calculating Absorbed Dose in Radiation Processing Applications

2010 ◽  
Author(s):  
Keyword(s):  
Absorbed Dose ◽  
Radiation Processing ◽  
Mathematical Methods

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.

Measurement of Activity of Spent Ionizing Sources Based on Cs-137 and Co-60 Placed in Well-Type Storage Facilities

2013 ◽  
Author(s):  
Mikhail N. Diordiy ◽  
Oleg A. Nikolaev ◽  
Olga K. Karlina ◽  
Valeriy E. Semenov ◽  
Ella A. Barinova
Keyword(s):  
Absorbed Dose ◽  
Activity Measurement ◽  
Mathematical Methods ◽  
Absorption Spectrometer ◽  
Storage Facilities

In this paper the method of activity measurement of spent radionuclide sources (SRS) based on Co-60 and Cs-137 placed in well-type storage facilities, in order to forecast the SRS activity which can be placed at this facility is described. The distribution of the absorbed dose through the absorption material is measured with the help of the described absorption spectrometer. This information allows determining the activity of individual radionuclides with the help of mathematical methods.

Antioxidant and Prebiotic Properties of γ- Radiation Processed Alginate

2019 ◽  
Vol 15 (2) ◽  
pp. 242-248 ◽  
Author(s):  
Bhoir Shraddha Anant ◽  
Chawla Surinder Pritamdas
Keyword(s):  
Sodium Alginate ◽  
Absorbed Dose ◽  
Practical Method ◽  
Cell Number ◽  
In Vitro Assays ◽  
Radiation Processing ◽  
E Coli ◽  
Prebiotic Activity ◽  
Gamma Irradiated

Background: Recently, many carbohydrates and their derivatives are being investigated for bioactivity. In the present study, we aimed at developing a novel antioxidant and prebiotic component by radiation processing of sodium alginate. </P><P> Method: Gamma irradiated (0.5 to 40 kGy) aqueous solution of sodium alginate was characterised by UV-visible, fluorescence, Fourier transform infrared (FT-IR) spectroscopy and thin layer chromatography (TLC) analysis. Antioxidant potential of processed alginate was determined using different in vitro assays and prebiotic activity was evaluated by co-culturing of E. coli and Lactobacillus plantarum. </P><P> Observation: Approximately, 50% of superoxide radicals and 75% of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals were scavenged by oligomers at concentrations of 1 mg/ml and 5 mg/ml, respectively. The ability to chelate iron and to inhibit the oxidation of β-carotene was not affected. Radiation processing improved the prebiotic activities as seen by enhanced cell number of L. plantarum by one log and reduction in E. coli count. The efficiency in reducing E. coli depended directly on the absorbed dose. Conclusion: Results suggest that radiation processing of alginate is a practical method for improving its antioxidant and prebiotic activity and thus improving the applicability of alginate in nutraceutical industries.

Investigation of the Radiation-Induced Signal of Electron Paramagnetic Resonance of Eggshell after Irradiation with Electron Beams

ANRI ◽  
2021 ◽  
Vol 0 (2) ◽  
pp. 75-84
Author(s):  
Anastasia Chumanova ◽  
Ruslan Vazirov ◽  
Sergey Sokovnin ◽  
Ekaterina Agdantseva ◽  
Anton Tsmokalyuk
Keyword(s):  
Comparative Analysis ◽  
Absorbed Dose ◽  
Radiation Processing ◽  
Paramagnetic Resonance ◽  
Radiation Induced ◽  
Epr Signal ◽  
Induced Signal ◽  
Chicken Eggs ◽  
Kinetics Of ◽  
Over Time

Because of the development of radiation processing of food and agricultural products it requires new methods of control over the processing and turnover of products. A promising method for monitoring is EPR spectrometry. This research presents the results of a study of the radiation induced EPR signal in eggshells. The URT-0.5 (0.5 MeV) and UALR-10-10 S2 (10 MeV) accelerators were used for irradiation. It shows the kinetics of radicals over time. The dependences of the EPR signal intensity on the absorbed dose were obtained, and a comparative analysis of the irradiation of chicken eggs with different energies was performed. The kinetics of radicals over time and the dependence of the intensity of the EPR signal on the absorbed dose are shown. A comparative analysis of the irradiation of chicken eggs with different energies is carried out.

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