Journal of Nuclear Research and Applications最新文献

{"title":"Investigation of Fluorine Cold Plasma Interaction with Cobalt Oxide as an etchant for decontamination metal waste","authors":"M. Askari, N. Darestani Farahani, M. Bakhshzad Mahmoudi","doi":"10.24200/jon.2024.1000","DOIUrl":"https://doi.org/10.24200/jon.2024.1000","url":null,"abstract":"","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"72 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140426994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gamma Radiation Effects on the Mechanical Stability of Polyethylene Composites: Effects of Filler Dimension and Absorbed Dose","authors":"Zahra Rafiei Sarmazdeh","doi":"10.24200/jon.2024.1001","DOIUrl":"https://doi.org/10.24200/jon.2024.1001","url":null,"abstract":"Incorporating multifunctional nanostructured materials that absorb radiation into polymers enhances their radiation-shielding properties. The role of boron nitride (BN) as an effective filler to enhance mechanical and shielding properties and resist irradiation has yet to be studied in detail. Our study examined the effects of gamma radiation doses ranging from 0 to 100 kGy on the mechanical properties of high-density polyethylene (HD) reinforced with two types of BN with different dimensions: hexagonal boron nitride (hBN) and boron nitride nanosheets (BNNSs). Scanning electron microscopy micrographs showed some aggregated plates with consistent distribution uniformly distributed in all regions in the matrix. This suggests proper adhesion between polyethylene and BN. The study showed that HD, 1 wt.% composite, and 1 wt.% nanocomposite samples experienced a 58%, 47%, and 33% reduction in elongation at break at 100 kGy compared to nonirradiated samples. The loss of tensile strength at 100 kGy for HD, 1 wt.% composite, and 1 wt.% nanocomposite was 57%, 44%, and 44%, respectively, compared to the nonirradiated samples. It is concluded that the addition of BNNSs in lower dimensions than hBN into polyethylene reduces the destructive effects of radiation. This is a way to improve the stability of polymer shields against ionizing radiation.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"1200 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140467182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evalution of minimum detection activity in a portable whole body counter using monte carlo method","authors":"Hosein Poorbaygi, Saadi Pourali, K. Moradi","doi":"10.24200/jon.2024.1004","DOIUrl":"https://doi.org/10.24200/jon.2024.1004","url":null,"abstract":"A portable body counter detects internal contamination in an emergency. Monte Carlo code estimates minimum detection activity (MDA) for a portable whole-body counter. In the case of outdoor open fields, natural background radiations were simulated. This counter has a chair geometry equipped with a NaI (Tl) detector (5cm x 5cm) inside a lead shield collimator consisting of a set of lines and a continuous component with monenergistic γ sources ranging from 300 to 2000 keV at intervals of 100 keV. This data matrix is folded with the measured spectrum outside the setup to estimate the observed spectrum in the detector. We evaluated the variation of the detector flux transmitted through the lead collimator and chair shield. This was done at different lead densities and different photon energies. Computational data were used to estimate the monitoring system MDA. This method is cheaper to design and test a counter system for low-level counting of γ emitting radionuclides than experimental methods.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"1224 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140467093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biodistribution and human absorbed dose evaluation of an organic-inorganic nanocomposite containing 198Au (198Au/PG4D)","authors":"Leila Moghaddam-Banaem, Simin Janitabar Darzi, Reza Rezaei","doi":"10.24200/jon.2024.1003","DOIUrl":"https://doi.org/10.24200/jon.2024.1003","url":null,"abstract":"An organic-inorganic nanocomposite 198 Au/PG4D was synthesized using polyamidoamine G4 dendrimer and applied as an anticancer agent against 4T1 carcinoma tumor as well as for biodistribution and human absorbed dose investigation. Radionuclide 198 Au was produced by irradiation of natural gold ( 197 Au) in a medium flux reactor with 3 × 10 11 n/cm 2 .s flux of thermal neutron. Gamma spectroscopy exhibited only one characteristic peak of 198 Au at 411 KeV as well as a radiochemical purity of more than 82% (using ITLC) was obtained for final formulation of 198 Au/PG4D (37MBq). A single intratumor injection of 3 . 26MBq (88 μ Ci) of 198 Au/PG4D resulted in statistically significant 65% growth inhibition in 4T1 tumor volume after 20 days. Biodistribution investigations showed that the tumor had a maximum accommodated activity owing to 198 Au/PG4D of 81.27% and 79.37% at 4 and 24 h post injection. The human’s absorbed dose, furthermore, was extrapolated via the biokinetics data of mice so that the doses absorbed in the critical organs such as the bone, lung, spleen, kidney, and liver are 0.0669, 1.1, 0.221, 0.0983 and 0.282 mGy/MBq, respectively.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"207 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140468550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermophysical Properties of Light and Heavy Water from Second Virial Coefficient; Isotopic Substitution Effect","authors":"Mohsen Najafi","doi":"10.24200/jon.2024.1002","DOIUrl":"https://doi.org/10.24200/jon.2024.1002","url":null,"abstract":"In this paper, some thermophysical properties of light and heavy water will be predicted and modeled using the virial equation of state (VEOS), and the effect of isotopic substitution will be studied. In this respect, by fitting the experimental and theoretical data of the second virial coefficient of light and heavy water in the temperature range of 300 to 1800 K, a new equation will be presented, using which the thermodynamic properties of the aforementioned fluids will be predicted","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"877 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140467511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of distribution coefficients of uranium and thorium on bedrock of Anarak Nuclear Waste Repository using Batch sorption experiments","authors":"H. Aghayan, Hasan Usefnia, Ali Maleki Farsan, Amir Masoud Taherian, Khalegh Khoushnodi, Taher Yousefi, Hasan Najafian, Z. Shiri-Yekta","doi":"10.24200/jon.2024.1005","DOIUrl":"https://doi.org/10.24200/jon.2024.1005","url":null,"abstract":"One of the key influencing parameters in the safe management of nuclear waste repositories is the distribution coefficient ( 𝐾 𝑑 ) of radionuclides on bedrock. In this study, (𝐾 𝑑 ) of uranium and thorium ions in intact bedrock were determined using batch experiments on crushed bedrock at seven different particle size fractions as well as three different initial concentrations of ions. Sorption experiments have been performed on crushed bedrock prepared from intact drill core samples and an aqueous solution containing desired ions from the local water (LW) near Anarak Nuclear Waste Repository. The results showed that both factors of the initial ions concentration as well as the size of the crushed bedrock particles significantly affect the value of the distribution coefficient so that ( 𝐾 𝑑 ) value increases with decreasing particle size and increasing ion concentration. Also, ( 𝐾 𝑑 ) calculated at three studied concentrations showed that the difference in the ( 𝐾 𝑑 ) values in smaller particles is large but decrease with increasing particle size and ( 𝐾 𝑑 ) curves for two concentrations of (100 and 10) ppm overlap at the end of the chart. Therefore, it can be concluded that for accurate calculation, it is better to use large particles and low concentrations of ions to determine ( 𝐾 𝑑 ) in intact bedrock. In this report, different mechanisms including chemical interactions, physical adsorption, and ion exchange were presented for ion adsorption by bedrock. The proposed mechanisms were related to the type of metal speciation of ions in the solution. Based on the obtained data, the preferred mechanism to describe the adsorption of uranium and thorium ions is composed of chemical interactions and physical adsorption.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"83 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140463960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of ideal and optimum cascades using Co-evolutionary Particle Swarm Optimization algorithm","authors":"K. Salimi, S. Dadashzadeh, M. Aghaee","doi":"10.24200/jon.2023.1072","DOIUrl":"https://doi.org/10.24200/jon.2023.1072","url":null,"abstract":"Ideal cascades for binary mixtures of isotopes are specified by no-mixing at confluent points and minimum total flows. Studies show that there are another types of cascades called the optimum cascade. These cascades have total flows lower than ideal cascades while separation factors are greater than unity and mixings are allowed. In this paper, using a Co-evolutionary Particle Swarm Optimization (CPSO) algorithm, the ideal and optimum cascades are compared in different operating regimes. The CPSO is a metaheuristic algorithm that uses the concept of co-evolution to deal with constrained engineering optimization problems. With the use of the CPSO algorithm, the weighting coefficients of the objective function are adjusted in a self-tuning manner. In this study, it is used to find the parameters of the optimum cascade. Ideal cascades are first classified into four types based on the various relationships between the number of stages of enriching and stripping sections. Three test cases are considered to compare ideal and optimum cascades. The first test case includes two examples of ideal cascades of symmetrical separation stages. In the first example, the total flow for the ideal type 3 cascade and its corresponding optimum cascade is obtained as ∑ 𝐿 𝑃⁄ = 176.7128 , and in the second example for the ideal type 1 cascade and its corresponding optimum cascade, it is obtained as ∑ 𝐿 𝑃⁄ = 202.7828 . The results show that for the ideal cascades of symmetrical separation stages, the ideal cascade coincides with the optimum cascade. In test case 2, the total flow for the ideal type 1 cascade of non-symmetrical separation stages and its corresponding optimum cascade (CPSO) is obtained as ∑ 𝐿 𝑃⁄ = 477.6170 and ∑ 𝐿 𝑃⁄ = 228.6997 , respectively. In test case 3, for the ideal type 2 cascade of non-symmetrical separation stages and its corresponding optimum cascade, the total flows are obtained as ∑ 𝐿 𝑃⁄ = 299.99 and ∑ 𝐿 𝑃⁄ = 191.6584, respectively. The results show that for ideal cascades of non-symmetrical separation stages, the non-mixing condition does not coincide with the condition of the minimum total flow.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139279674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of PVA-GTA Fricke Gel Dosimeters Exposed to 60Co Source","authors":"E. Edalatkhah, P. Rezaeian","doi":"10.24200/jon.2023.1073","DOIUrl":"https://doi.org/10.24200/jon.2023.1073","url":null,"abstract":"","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139279482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Mutants of Trichoderma Species in Modulating Salinity Stress of Beans (Phaseolus vulgaris L. CV. Khomein)","authors":"Z. Rezaloo, S. Shahbazi, A. A. Ali loo, M. Sarajuoghi","doi":"10.24200/jon.2023.1075","DOIUrl":"https://doi.org/10.24200/jon.2023.1075","url":null,"abstract":"Salinity in Iran's agricultural soils is a growing problem and can cause yield loss in the production of many products, including beans. One of the most biocompatible and effective solutions to this problem is bio-priming with microorganisms tolerant to salinity stress (such as Trichoderma). This study's salinity treatment (NaCl 100 mM) doubles the tolerance threshold of the bean plant and the effect of biopriming with Trichoderma isolates (wild-type and mutant) has been investigated. A mutation induction method (250 Gy) was used to increase tolerance to salinity in Iranian Trichoderma. Growth components, germination, allometric index, seedling tissue water, and vigor were measured at the seedling stage. Results from analysis of variance and comparison of the average showed that biological priming of beans with Trichoderma (wild type and mutant) fungal species had a significant advantage over control of salinity stress. However, the modulating effect of salt stress was greater in seeds inoculated with mutant species than in their wild type.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139279389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular Dynamics Study of Microstructural Evolution and Damage-Depth Induced by Isotropic Irradiation on Zr-1%Nb Alloy","authors":"M. Basaadat, S. Sheykhi","doi":"10.24200/jon.2023.1074","DOIUrl":"https://doi.org/10.24200/jon.2023.1074","url":null,"abstract":"Zirconium alloys with niobium have extensive applications in the nuclear industry, especially in fuel cladding. In this study, we consider the lattice structure of Zr-1%Nb alloy and study the damage depth (DD) due to irradiation on the structure of this alloy which results from the collision cascade (CC) phenomenon. It has been shown that the DD in the structure is directly related to Primary Knocked-on Atom (PKA) energy. Because the structure of Zr-1%Nb is not homogeneous, DD is highly affected by the incident direction of irradiation. Both Zr and Nb atoms were considered as PKA’s and the results show that the average of DD is larger for Nb than Zr. Next, the CC phenomenon has been considered for this alloy, and microstructure evolution has been studied at low temperatures and low PKA energy. The results show the formation of some self-interstitials (SI’s) during the CC phenomenon and no SI clusters are observed.","PeriodicalId":324615,"journal":{"name":"Journal of Nuclear Research and Applications","volume":"16 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139279249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}