gamma radiation Articles
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Sulphur removal from used automotive lubricating oil by ionising radiation
In this work, gamma radiation was used to remove sulphur from used automotive lubricating oil. The sample was fractioned and irradiated with 10, 20, 50, 100, 200 and 500 kGy doses in a 60Co irradiator (Gammacell-220 – 12 kCi). Fifty percent and 70% (v/v) of MilliQ water and 30% (v/v) of hydrogen peroxide were used to improve the radiolysis. The sulphur content, before and after the irradiation, ...
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Protection from gamma-radiation insult to antioxidant defence and cellular DNA by POLY-MVA, a dietary supplement containing palladium-lipoic acid formulation
Whole-body exposure to gamma radiation was found to result in damage to cellular DNA and lowering of antioxidant levels in various tissues. Administration of POLY-MVA, a palladium-lipoic acid formulation, for seven days prior to whole body gamma radiation significantly reduced the damage to cellular DNA in bone marrow and blood leukocytes, as well as preventing the radiation-induced lowering of ...
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Effect of ionizing radiation on antioxidant compounds present in cork wastewater
A preliminary study of the gamma radiation effects on the antioxidant compounds present in cork cooking water was carried out. Radiation studies were performed using radiation between 20 and 50 kGy at 0.4 and 2.4 kGy h−1. The radiation effects on organic matter content were evaluated by chemical oxygen demand. The antioxidant activity was measured by ferric reducing power assay. The ...
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The influence of 60Co gamma radiation on the action of phenolic compounds of Anadenanthera colubrina (Vell.) Brenan in the microbiological control of crude extracts
This study investigates the influence of gamma radiation on the total phenols, tannins and antimicrobial activity of ethanolic plant extracts of the bark and leaves of Anadenanthera colubrina (Vell.) Brenan (angico). The extracts were separated into four groups (0, 5, 7.5 and 10 kGy) to quantify total phenols (Folin-Ciocalteu method), tannins (precipitation of casein), and antimicrobial activity ...
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Study of the use of thermoluminescent materials in mixed fields
The scientific research and the application of the thermoluminescence phenomenon have been advancing for the last two decades. Thermoluminescent Detectors (TLDs) present advantages when used in dosimetry. These advantages include reduced size and the non-use of wires. As a disadvantage, we see the loss of all signals after the reading (information) of the detectors. In the present study, we used ...
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Change of chlorophyll fluorescence transients in Arabidopsis plants irradiated with low-dose radiation using a gamma phytotron
The present study characterised chlorophyll fluorescence transients significantly altered in Arabidopsis leaves upon exposure to gamma radiation for 7.5 days at a low-dose rate of 0.8 Gy day−1 in a gamma phytotron. The JIP transients of Kautsky fluorescence induction were substantially affected by the consecutive exposure to the low-dose-rate gamma radiation. The performance index of ...
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Effect of 137Cs gamma radiation on the system bioindicator Tradescantia pallida
The use of the bioindicator Tradescantia clone 4430 as a biomonitor is limited to a short period of time in regions of hot climate. This paper describes the use of Tradescantia pallida as a bioindicator, to verify its sensitivity to gamma radiation from a 137Cs source and to monitor places of low doses of ionising radiation in tropical climates. Specimens of the T. pallida were exposed to ...
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Medicinal fungus Ganoderma lucidum protects cellular DNA in mice exposed to whole–body gamma radiation
Ganoderma lucidum is a medicinal fungus with a variety of biological activities and is used for the treatment of various diseases, including cancers. The present work is focused on the radioprotective property of G. lucidum in Swiss albino mice. Whole–body exposure of the mice to gamma radiation results in damage to cellular DNA in various tissues, such as brain, bone marrow, blood and intestine, ...
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Effects of high dose rate gamma radiation on survival and reproduction of Biomphalaria glabrata
Ionising radiations can cause mutagenesis and death depending on the dose. Based on this, the effects of 60Co gamma radiation at high dose rate on the survival and reproduction of Biomphalaria glabrata, one of the hosts of Schistosoma mansoni, were evaluated in this paper. The results demonstrated lethality in all irradiated groups, despite the lack of high dose rate on the lethality, compared to ...
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Effect of silver nanoparticle and glycyrrhizic acid (SN-GLY) complex on repair of whole body radiation-induced cellular DNA damage and genomic instability in mice
Silver nanoparticles (SN) were redispersed in aqueous solution of Pluronic F127 and complexed with the phytoceutical, glycyrrhizic acid (GLY) to obtain SN-GLY complex. The ability of the SN-GLY complex to offer protection against ionising radiation in post-irradiation scenarios was evaluated in ex vivo and in vivo models using Swiss albino mice. Treatment of mouse blood leucocytes with SN-GLY ...
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Dose response of polyvinyl alcohol films dyed by methyl red under gamma irradiation
Polyvinyl Alcohol (PVA) films containing Methyl Red (MR) were prepared by the cast drying of an aqueous solution of the constituents. Irradiation was performed in air at room temperature with 60Co gamma rays at a dose rate of 0.9 kGy/h. The characteristics of the films were analysed by a spectrophotometer and densitometer. The dose response of the films was described by the energy transfer model. ...
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Assessment of the environmental outdoor gamma radiation levels in Sao Paulo City
Dose values from natural radiation sources in several sites of Sao Paulo City were assessed from environmental outdoor gamma radiation levels, by using CaSO-4:Dy thermoluminescent dosimeters. Twelve monitoring stations were placed in different regions of the town including both urban and outskirts areas and the measurements were carried out quarterly and seasonally. The average annual effective ...
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Evaluation of natural radioactivity in rocks of Nilgiri hills and their radiation hazard to mankind
Twenty three rock samples were collected from various altitudes of Nilgiri hills, Tamil Nadu, India. A survey was carried out to determine the activity concentration of selected radionuclides (238U, 232Th, 40K) by means of gamma–ray spectroscopy using NaI (Tl) detector. From the measured spectra, the mean activity of 238U, 232Th, 40K are 7.13 Bq kg−1, 30.47 Bq kg−1 and 346.06 Bq kg−1, ...
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Calibration and characterisation of extremity dosimeters
The increasing use of radiation in the medical field is providing great advances in health improvement. However, these techniques can generate an increase in the number of professionals exposed to radiation. The Brazilian authorities (Brazilian Nuclear Energy Commission ? CNEN) have imposed the monitoring of specific body parts of professionals. One of these obligations is the monitoring of the ...
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Synthesis of CdSe quantum dots in PVA matrix by radiolytic methods
Polymer films of polyvinyl alcohol (PVA) containing CdSe quantum dots of various sizes from 3 nm to 5 nm have been synthesised by the radiation-chemical route using CdSO4 and Na2SeSO3 as the starting materials under a reducing condition. 2 MeV electron beam from an electron accelerator and the gamma radiation from a cobalt-60 gamma chamber were used as the irradiation sources for the syntheses. ...
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Enhancement in repair of radiation-induced DNA strand breaks in vivo by tocopherol monoglucoside
Damage to cellular DNA and its repair in the peripheral blood leucocytes of mice exposed to 4 Gy whole-body gamma-radiation was studied by alkaline single cell gel electrophoresis or comet assay. The comet parameters of DNA, such as comet tail length, % of DNA in tail, tail moment and olive tail moment, were found increased in the leucocytes from irradiated animals due to radiation-induced DNA ...
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Gamma radiolysis of ceftriaxone sodium for water treatment: assessments of the activity
As large quantities of antibiotics have been misused in human and veterinary medicine, many different classes of antibiotics with low concentration have been detected in the environmental water. This existence may cause severe ecosystem alterations. Ceftriaxone sodium was employed as the targeted antibiotic to evaluate gamma radiolysis of antibiotics based on the primary elimination test and ...
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Nuclear shipyard worker study (1980–1988): a large cohort exposed to low-dose-rate gamma radiation
This paper is a summary of the 1991 Final Report of the Nuclear Shipyard Worker Study (NSWS), a very comprehensive study of occupational radiation exposure in the US. The NSWS compared three cohorts: a high-dose cohort of 27,872 nuclear workers, a low dose cohort of 10,348 workers, and a control cohort of 32,510 unexposed shipyard workers. The cohorts were matched by ages and job categories. ...
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Seedless synthesis of gold nanorods employing isopropyl radicals generated using gamma radiolysis technique
The one step synthesis of short aspect ratio gold nanorods using gamma radiation method by incorporating cetyltrimethyl ammonium bromide (CTAB) as a directing agent is reported in this communication. In present method of synthesis, isopropyl radical is selectively generated in the system by carrying out radiolysis of aqueous solution containing 2.75 × 10−2 mol dm−3 of acetone, ...
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Use of ionising radiation technology as a method of postharvest conservation of guava
Characteristics sensory and physical-chemical were evaluated in guavas (Psidium guajava L.) after doses received of 200, 400 and 600 Gy and stored for 12 days under 10°C followed by two and four days under 20°C. Irradiated fruit had a greater index of acceptability in the sensory analysis for external appearance and showed minor symptoms of pulp disintegration after four days. The ...
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