Thermoluminescence Characteristics of Aluminium Oxide Doped Carbon Exposed to Cobalt-60 Gamma Radiation

2015 ◽  
Vol 1107 ◽  
pp. 553-558
Author(s):  
Nurul Syazlin Saharin ◽  
Husin Wagiran ◽  
Abdul Rahman Tamuri
Keyword(s):  
Ionizing Radiation ◽  
Aluminum Oxide ◽  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Linear Relationship ◽  
Glow Curve ◽  
Gamma Ray ◽  
Carbon Doped ◽  
The Right ◽  
Delivered Dose

This study concerns on the thermoluminescence (TL) characteristics of carbon doped aluminum oxide (Al2O3:C) as ionizing radiation dosimeter. The thermoluminescence response, linearity and sensitivity subjected to Co-60 gamma irradiation were investigated. Carbon doped (0.2 mol %) aluminum oxide samples in form of powder were irradiated to 1.25 MeV Co-60 gamma ray with doses ranging from 1 Gy to 50 Gy. Irradiations were performed by using Co-60 gamma ray model 220 Excel with the source activity, A = 2.310925534 kGy h1at Universiti Kebangsaan Malaysia. The glow curves were analysed to determine various characterizations of the TLDs. It is shown that the glow curve of the sample contains a single peak at about 180°C with broad peak appears at the right of the spectrum. It is also shown that the TL intensity has linear relationship with delivered dose and the average TL sensitivity was calculated as 3.30 nC mg-1Gy-1.

SOFTWARE AT MOBILE SPECTROMETER WITH CZT-DETECTOR

2021 ◽  
Vol 4 (1) ◽  
pp. 100-110
Author(s):  
Oleh V. Maslov ◽  
Volodymyr V. Osadchyy
Keyword(s):  
Ionizing Radiation ◽  
Gamma Radiation ◽  
Power Supply ◽  
Gamma Ray ◽  
Low Voltage ◽  
Energy Calibration ◽  
Semiconductor Detectors ◽  
Detector Module ◽  
Gamma Ray Spectrometer ◽  
Multichannel Analyzer

The technology is based on a semiconductor CdZnTe-portable (almost the size of a mobile phone) gamma-ray spectrometer with high resolution, which provides high efficiency of rapid identification of radionuclides and assessment of radiation dose from low to moderately high levels. The CdZnTe gamma-ray spectrometer is a highly efficient device based on the use of CdZnTe (CZT) semiconductor detectors operating at room temperature with very low power consumption, a digital multichannel analyzer, and a microcomputer. CdZnTe-portable spectrometer is a self-contained device and consists of three modules - a detector module, a multichannel analyzer, and a microcomputer. The detector module contains a high-quality CdZnTe detector, a preamplifier, and a high voltage power supply for the detector. There are detector modules with different volumes of the CZT detector from 5 mm3 to 1600 mm3. It is possible to use a multi-detector system. The analyzer module contains an amplifier, a digital signal processor, a low voltage power supply, and a computer interface. The microcomputer software interacts with the multichannel analyzer, analyzes gamma spectra, and provides the accumulation of time profiles of the dose of gamma radiation, communication with other information systems. Spectrometric measurements in real-time make it possible to use "electronic collimation" technologies to build a map of the radiation field and localize sources of ionizing radiation, with the subsequent certification of identified sources, creation of an effective radiation monitoring system with the functions of certification of ionizing sources radiation. The corresponding software allows you to solve the following tasks – building a three-dimensional map of the fields of ionizing radiation of various degrees of spatial detailing, taking into account the radiation energy, localization, and certification of gamma radiation sources. The special laboratory kit is based on μSPEC microspectrometers. A LattePanda single board computer is used to control the operation of spectrometers, collect and analyze data. LattePanda – A Windows 10 Computer with integrated Arduino. This explains the choice of LattePanda. Windows 10 application allows you to use the WinSPEC software to control the multichannel analyzer operation supplied with the spectrometer. The built-in Arduino allows you to remote control the movement of the radiation source during laboratory experiment. Both the traditional problems of calibrating spectrometers (energy calibration and efficiency curves), including those for various source geometries, processing the measured spectra using standard programs, calculating the activity of sources, and the problem of creating a spectra processing program and a spectrometer control program are considered. The values of the minimum detectable activity are given.

RADIOSENSITIVITY OF SOFT WHEAT SEEDS TO GAMMA RADIATION

2021 ◽  
Vol 55 (2 (255)) ◽  
pp. 165-171
Author(s):  
Liya A. Minasbekyan ◽  
Inesa A. Avagyan
Keyword(s):  
Ionizing Radiation ◽  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Mitotic Activity ◽  
Cell Nucleus ◽  
Growth And Development ◽  
Growth Parameters ◽  
Soft Wheat ◽  
Different Doses ◽  
Wheat Seeds

The study of the effect of different doses of $\gamma$-irradiation on the growth and development of seedlings of soft wheat seeds, resistance, and germination of seeds to irradiation has been carried out. The data show that the seeds of common wheat are resistant to ionizing radiation and up to 80% of the seeds remained viable. Under the influence of ionizing radiation, the functional and mitotic activity of the cell nucleus is disrupted, which has a significant effect on the growth parameters of the seedlings of irradiated seeds.

scholarly journals Effect of Gamma Radiation on Morpho-Physiological Characters of Soybean

2015 ◽  
Vol 7 (2) ◽  
pp. 25-30
Author(s):  
S Sarker ◽  
MS Rahman ◽  
MR Islam ◽  
S Hasna ◽  
MS Islam
Keyword(s):  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Seed Yield ◽  
Gamma Ray ◽  
The Other ◽  
Control Treatment ◽  
Branch Plant ◽  
Four Levels ◽  
And Control ◽  
Physiological Characters

An experiment was carried out at the experimental farm of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh during the period from January, 2011 to April, 2011. The study was conducted to evaluate the effect of gamma radiation on morpho-physiological characters of BARI soybean. Four levels of gamma irradiation viz. 200, 300, 400 and 500 Gy ?-ray from 60C source and control were irradiated on assigned two genotypes viz. BARI soybean 5 and BARI soybean 6. Data for growth analyses were collected at different days after sowing. Results revealed that the soybean varieties and gamma irradiation significantly affected morpho-physiological characters where BARI soybean 5 and 200 Gy ?-ray levels produced the greater results alone or combinations. This combination produced the tallest plant (37.42 cm), maximum leaf and branch plant-1 (23.15 and 2.10) at 75 DAS. 200 Gy ?-ray irradiated plants of BARI soybean 5 produced the highest seed yield (2373.70 kg ha-1) followed by control treatment (1887.90 kg ha-1) at the same variety. On the other hand, the plants consequential from 500 Gy ?-ray radiated of BARI soybean 5 had shown the lowest seed yield (1050.70 kg ha-1). This result indicating that irradiation significantly decreased on seed yield with increasing doses of gamma rays. So, the variety BARI soybean 5 and 200 Gy ?-ray alone or combination had outstanding superiority for plant growth over the other gamma ray levels.DOI: http://dx.doi.org/10.3329/jesnr.v7i2.22199 J. Environ. Sci. & Natural Resources, 7(2): 25-30 2014

Effect of Gamma Radiation on Structural, Optical and Electrical Properties of nanostructured CdHgTe Thin Films

2018 ◽  
Vol 1 (1) ◽  
pp. 26-31 ◽  
Author(s):  
B Babu ◽  
K Mohanraj ◽  
S Chandrasekar ◽  
N Senthil Kumar ◽  
B Mohanbabu
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Gamma Radiation ◽  
Glass Substrate ◽  
Gamma Ray ◽  
Optical And Electrical Properties ◽  
Deposition Technique ◽  
Polycrystalline Structure ◽  
Dc Electrical Conductivity

CdHgTe thin films were grown onto glass substrate via the Chemical bath deposition technique. XRD results indicate that a CdHgTe formed with a cubic polycrystalline structure. The crystallinity of CdHgTe thin films is gradually deteriorate with increasing the gamma irradiation. EDS spectrums confirms the presence of Cd, Hg and Te elements. DC electrical conductivity results depicted the conductivity of CdHgTe increase with increasing a gamma ray dosage

THE EFFECT OF GAMMA STERILIZATION AND ITS EFFECT ON MICROSCOPIC STRUCTURE OF DEEP FROZEN DOG SKULL

2018 ◽  
pp. 37-40
Author(s):  
Phuong Thao Tien Nguyen ◽  
Anh Hung Tran ◽  
Van Tam Le ◽  
Huu Thao Phung ◽  
Phan Quynh Anh Nguyen
Keyword(s):  
Structural Change ◽  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Key Words ◽  
Bone Matrix ◽  
Infected Tissue ◽  
Microscopic Structure ◽  
Bacteriological Examination ◽  
Microscopic Scale

Objective: To evaluate the effect of gamma sterilization and its effect on microscopic structure of deeply frozen dog skull. Subjects and methods: 50 pairs of dog skull fragments have the same size,which were taken symmetrically through the midline of the skull, were divided into two lots. Evident lot consisting of 50 pieces are just deeply frozen, not irradicated. Experimental lot which was composed of 50 pieces were deeply frozen and exposed to 25kGy of gamma radiation. Afterwards, to evaluate the effect of gamma sterilization and compare the alter of bone matrix between lot groups. Results: After gamma irradiation, all dog skull fragments were negative with bacteriological examination. In microscopic scale, no difference was found between the two lots and there was no structural change in the irradiated fragments of all dog skull. Conclusion: Gamma irradiation with 25 kGy: (i) It has the ability to kill bacteria completely in the type of bacteria commonly infected tissue. (ii) It does not alter the structure of dog skull in microstructures. Key words: dog skull, gamma, sterilize

Biochemical and Histopathological Evaluation of the Radioprotective Effects of Melatonin Against Gamma Ray-Induced Skin Damage

2019 ◽  
Vol 12 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Dheyauldeen Shabeeb ◽  
Masoud Najafi ◽  
Ahmed Eleojo Musa ◽  
Mansoor Keshavarz ◽  
Alireza Shirazi ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Histopathological Examination ◽  
Radical Scavenging ◽  
Limiting Factor ◽  
Skin Damage ◽  
Exposed Skin ◽  
Male Wistar Rats ◽  
Time Periods ◽  
Skin Damages ◽  
The Right

Background:Radiotherapy is one of the treatment methods for cancers using ionizing radiations. About 70% of cancer patients undergo radiotherapy. Radiation effect on the skin is one of the main complications of radiotherapy and dose limiting factor. To ameliorate this complication, we used melatonin as a radioprotective agent due to its antioxidant and anti-inflammatory effects, free radical scavenging, improving overall survival after irradiation as well as minimizing the degree of DNA damage and frequency of chromosomal abrasions.Methods:Sixty male Wistar rats were randomly assigned to 4 groups: control (C), melatonin (M), radiation (R) and melatonin + radiation (MR). A single dose of 30 Gy gamma radiation was exposed to the right hind legs of the rats while 40 mg/ml of melatonin was administered 30 minutes before irradiation and 2 mg/ml once daily in the afternoon for one month till the date of rat’s sacrifice. Five rats from each group were sacrificed 4, 12 and 20 weeks after irradiation. Afterwards, their exposed skin tissues were examined histologically and biochemically.Results:In biochemical analysis, we found that malondialdehyde (MDA) levels significantly increased in R group and decreased significantly in M and MR groups after 4, 12, and 20 weeks, whereas catalase (CAT) and superoxide dismutase (SOD) activities decreased in the R group and increased in M and MR groups during the same time periods compared with the C group (p<0.05). Histopathological examination found there were statistically significant differences between R group compared with the C and M groups for the three different time periods (p<0.005, p<0.004 and p<0.004) respectively, while R group differed significantly with MR group (p<0.013). No significant differences were observed between C and M compared with MR group (p>0.05) at 4 and 20 weeks except for inflammation and hair follicle atrophy, while there were significant effects at 12 weeks (p<0.05).Conclusion:Melatonin can be successfully used for the prevention and treatment of radiation-induced skin injury. We recommend the use of melatonin in optimal and safe doses. These doses should be administered over a long period of time for effective radioprotection and amelioration of skin damages as well as improving the therapeutic ratio of radiotherapy.

Awareness of radiation doses and risks among radiology residents, fellows, specialists, consultants and technologists in Jeddah, Saudi Arabia: Cross-Sectional Study. (Preprint)

2019 ◽  
Author(s):  
Bashayer Hassan Shuaib ◽  
Rahaf Hisham Niazi ◽  
Ahmed Haitham Abduljabbar ◽  
Mohammed Abdulraheem Wazzan
Keyword(s):  
Interventional Radiology ◽  
Ionizing Radiation ◽  
Statistical Significance ◽  
Knowledge Score ◽  
P Value ◽  
Radiation Doses ◽  
Cross Sectional ◽  
The Right ◽  
Interventional Radiology Procedures ◽  
Radiology Staff

BACKGROUND Radiology now plays a major role to diagnose, monitoring, and management of several diseases; numerous diagnostic and interventional radiology procedures involve exposure to ionizing radiation. Radiology now plays a major role to diagnose, monitoring, and management of several diseases; numerous diagnostic and interventional radiology procedures involve exposure to ionizing radiation. OBJECTIVE This study aimed to discover and compare the awareness level of radiation doses, protection issues, and risks among radiology staff in Jeddah hospitals. METHODS A cross-sectional survey containing 25 questions on personal information and various aspects of radiation exposure doses and risks was designed using an online survey tool and the link was emailed to all radiology staff in eight tertiary hospitals in Jeddah. The authors were excluded from the study. A P-value of < .05 was used to identify statistical significance. All analyses were performed using SPSS, version 21. RESULTS Out of 156 participants the majority 151 (96.8%) had poor knowledge score, where the mean scores were 2.4±1.3 for doses knowledge, 2.1±1.1for cancer risks knowledge, 2.3±0.6 for general information, and 6.7±1.9 for the total score. Only 34.6% of the participants were aware of the dosage of a single-view chest x-ray, and 9.0% chose the right answer for the approximate effective dose received by a patient in a two-view. 42.9% were able to know the correct dose of CT abdomen single phase. There is a significant underestimation of cancer risk of CT studies especially for CT abdomen where only 23.7% knew the right risk. A p-value of <0.05 was used to identify statistical significance. No significant difference of knowledge score was detected regarding gender (P =.2) or work position (P=.66). CONCLUSIONS Our survey results show considerable inadequate knowledge in all groups without exception. We recommended a conscientious effort to deliver more solid education and obtain more knowledge in these matters and providing periodic training courses to teach how to minimize the dose of radiation and to avoid risk related. CLINICALTRIAL not applicable

Synthesis, Quantum Chemical Calculations, Molecular Docking and Studying the Effect of High Energetic Gamma Irradiation on Cu(I, II), Zn(II) and Cd(II) Complexes with their Antibacterial Activity.

2021 ◽  
Author(s):  
Hussein Elganzory
Keyword(s):  
Molecular Docking ◽  
Gamma Irradiation ◽  
Density Functional ◽  
Topoisomerase Ii ◽  
Gamma Ray ◽  
Inhibitory Effect ◽  
Molar Conductance ◽  
Basis Set ◽  
Conformational Structure ◽  
Before And After

Abstract New complexes of Cu(I,II), Zn(II) and Cd(II) of thiosemicarbazide ligand 1-(p-(methylanilinocetyl-4-phenyl-thiosemicarbazide)(H2LB) have been prepared and characterized by 1HNMR, Mass spectra, FT-IR, elemental analyses, molar conductance, UV-visible spectra, magnetic susceptibility measurements, thermogravimetric analysis (TGA/DTG) and X-ray diffraction pattern before and after irradiation. The results confirmed that gamma ray enhanced the stability of irradiated compounds as compared to non-irradiated compounds. XRD patterns proved that increasing the crystallinity of the samples and the particles in nano range after gamma irradiation. The obtained data indicated that the Cu(I) and Cd(II) ions coordinated to the ligand through the (C = O), N(2)H and (C = S), the ligand behaves as neutral tridentate. While in complexes Cu(II) and Zn(II)complexes (B2 and B3) the ligand behave as neutral tetradentate and coordination take place via (C = O) and two N(2)H. These studies revealed that, two kinds of stereochemical geometries; Cu(II) and Zn(II) complexes were predicted to be octahedral, Cu(I) and Cd(II)complexes were found to be tetrahedral. The theoretical conformational structure analyses were performed using density functional theory for ligand and complexes at B3LYP functional with 6-31G(++)d,p basis set for ligand and LANL2DZ basis set for complexes. The ligand and its metal complexes have been tested for their inhibitory effect on the growth of bacteria against gram-positive (Streptococcus pyogenes) and gram-negative (Escherichia coli). Results suggested that in case of 1µg/ml and 5µg/ml for Cu(II) and Zn(II) complexes have higher activity than other complexes. The chelation could facilitate the ability to cross the cell membrane of E. coli and can be explained by Tweedy’s chelation theory. Molecular docking investigation proved that; the Zn(II) complex had interesting interactions with active site amino acids of topoisomerase II DNA gyrase enzymes (code: 2XCT).

Mass Treatment of Flooded Archival Materials by Gamma Radiation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Matteo Montanari ◽  
Sara Pipponzi ◽  
Pietro Livi ◽  
Antonio Prodi
Keyword(s):  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Culture Method ◽  
Test Species ◽  
Atp Assay ◽  
Recovery Processes ◽  
Mycelia Growth ◽  
Thermal Drying ◽  
Radiation Treatments ◽  
Main Components

Abstract This work describes mass recovery processes of flooded archival materials at industrial scale. The presence of fungi on paper represents a threat to the integrity of the document because they degrade cellulose, one of the main components of paper. Gamma radiation treatments are investigated as mass disinfection agents for their high penetrating power, speed of treatment, and absence of risk due to chemical residuals. We compared two different recovery processes: thermal drying followed by gamma irradiation and gamma irradiation followed by thermal drying. Both these processes were conducted simultaneously on naturally contaminated archival items and on paper specimens artificially contaminated with species test. Efficacy was assessed by culture method and ATP assay, right after the treatments and after four years of storage at room temperature. Coupling gamma irradiation with a drying step with dry heat at 55–60 °C reduces the fungal loads on natural items up to levels close to the detection limits, and the reduction is maintained after four years. On artificial specimens, spore germination is completely inhibited, mycelia growth is also highly affected, but the melanised test species appear to be more resistant. A synergistic effect between gamma irradiation, water content, and thermal drying is highlighted in this paper.

Characterization of a family of gamma-ray-induced CHO mutants demonstrates that the ldlA locus is diploid and encodes the low-density lipoprotein receptor

1986 ◽  
Vol 6 (9) ◽  
pp. 3268-3277
Author(s):  
R D Sege ◽  
K F Kozarsky ◽  
M Krieger
Keyword(s):  
Gamma Irradiation ◽  
Cho Cells ◽  
Gamma Ray ◽  
Receptor Gene ◽  
Low Density Lipoprotein ◽  
Chinese Hamster ◽  
Ldl Receptor ◽  
Density Lipoprotein ◽  
Low Density ◽  
Ldl Receptors

The ldlA locus is one of four Chinese hamster ovary (CHO) cell loci which are known to be required for the synthesis of functional low-density lipoprotein (LDL) receptors. Previous studies have suggested that the ldlA locus is diploid and encodes the LDL receptor. To confirm this assignment, we have isolated a partial genomic clone of the Chinese hamster LDL receptor gene and used this and other nucleic acid and antibody probes to study a family of ldlA mutants isolated after gamma-irradiation. Our analysis suggests that there are two LDL receptor alleles in wild-type CHO cells. Each of the three mutants isolated after gamma-irradiation had detectable deletions affecting one of the two LDL receptor alleles. One of the mutants also had a disruption of the remaining allele, resulting in the synthesis of an abnormal receptor precursor which was not subject to Golgi-associated posttranslational glycoprotein processing. The correlation of changes in the expression, structure, and function of LDL receptors with deletions in the LDL receptor genes in these mutants directly demonstrated that the ldlA locus in CHO cells is diploid and encodes the LDL receptor. In addition, our analysis suggests that CHO cells in culture may contain a partial LDL receptor pseudogene.

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