Brazilian Journal of Radiation Sciences最新文献

A numerical validation between the neutron transport and diffusion theories for a spatial kinetics problem 针对空间动力学问题的中子输运和扩散理论的数值验证

Brazilian Journal of Radiation Sciences Pub Date : 2024-05-17 DOI: 10.15392/2319-0612.2024.2361

Rodrigo Zanette, Liliane Basso Barichello, Claudio Zen Petersen

引用次数: 0

Determinação da Dose Absorvida na Água em Câmaras de irradiador de pesquisa de Cs-137 utilizando o Dosímetro Fricke 使用弗里克剂量计测定铯-137 研究辐照室中水中吸收的剂量

Brazilian Journal of Radiation Sciences Pub Date : 2024-05-10 DOI: 10.15392/2319-0612.2024.2418

Natasha Briggs, Andrea Mantuano Coelho da Silva, Arissa Pickler Oliveira, Domingos Cardoso D'Oliveira, Aneuri Souza de Amorim

引用次数: 0

Analysis of the SWOT matrix as a strategy for implementing the Ap-Th1000 Reactor in Brazil 作为巴西 Ap-Th1000 反应堆实施战略的 SWOT 矩阵分析

Brazilian Journal of Radiation Sciences Pub Date : 2024-05-03 DOI: 10.15392/2319-0612.2024.2405

Francky Roger Araujo da Silva, Giovanni Laranjo de Stefani, Marcelo Vilela da Silva

{"title":"Analysis of the SWOT matrix as a strategy for implementing the Ap-Th1000 Reactor in Brazil","authors":"Francky Roger Araujo da Silva, Giovanni Laranjo de Stefani, Marcelo Vilela da Silva","doi":"10.15392/2319-0612.2024.2405","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2405","url":null,"abstract":"This article analyzes the SWOT Matrix for the implementation of the AP-Th1000 reactor with thorium fuel, aiming at a future replacement of the current nuclear reactors that use uranium as fuel by thorium. There was a need for an in-depth study of the national and international literature linked to the Brazilian reality. After that, specific meetings were held to detect all possible situations of the 4 main points of the SWOT matrix. During the sessions, which averaged 1 hour, the authors' industrial and academic expertise was demonstrated in competencies such as creativity, collaboration, effective communication, openness and tolerance, quick thinking, synthesis ability, problem focus, and flexibility during the discussions of over 50 items found in the analysis of the 4 points of the SWOT matrix. Each meeting was divided into three parts. The first part, which would be the Creative phase; and a second part, which would be the Critical phase; and, finally, the third phase, where ideas are filtered for the permanence of those that were better founded and of better acceptance. Then, the aspects listed were classified into 4 categories: Strengths (S), Weaknesses (W), Opportunities (O), and Threats (T). After the classification, a ranking of priorities was made, in descending order of importance, according to the authors, of the weaknesses and threats, neutralization suggestions were made. Finally, the data obtained were analyzed. We concluded through the SWOT analysis, we can observe an expressive amount of benefits of using the AP1000 reactor with MOX of Thorium and Uranium in the development of nuclear energy generation technologies in Brazil.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"135 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141015247","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}

引用次数: 0

Resolução espacial de um tomógrafo PET de pequenos animais usando o isótopo 68Ga 使用 68Ga 同位素的小动物 PET 扫描仪的空间分辨率

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-24 DOI: 10.15392/2319-0612.2024.2404

Victoria M. Garcia, A. C. M. Silva, R. Gontijo, Andréa Vidal Ferreira

引用次数: 0

Generalized linear models applied to the analysis of the effectiveness of the Sterile Insect Technique 应用广义线性模型分析昆虫无菌技术的有效性

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-17 DOI: 10.15392/2319-0612.2024.2352

Guilherme Rodrigues, Ariane Campolim Cristino, Daniela R. Cantane, H. O. Florentino, Marco A. R. Fernandes, Paulo E. M. Ribolla, Rogerio A. Oliveira

{"title":"Generalized linear models applied to the analysis of the effectiveness of the Sterile Insect Technique","authors":"Guilherme Rodrigues, Ariane Campolim Cristino, Daniela R. Cantane, H. O. Florentino, Marco A. R. Fernandes, Paulo E. M. Ribolla, Rogerio A. Oliveira","doi":"10.15392/2319-0612.2024.2352","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2352","url":null,"abstract":"Aedes aegypti mosquito, popularly known as the dengue mosquito, represents a serious public health problem, because it is the vector responsible for several serious diseases such as Chikungunya fever, Zika virus and Dengue, the latter of which has a higher incidence in the Brazilian population. That mosquito has a high capacity for adaptation in the most diverse types of environments, mainly in places with high population density and lack of basic sanitation, factors that favor its proliferation. The control methods used by the epidemiological surveillance agencies are divided into three modalities: mechanical control, chemical control and biological control. Among the biological control methods, the Sterile Insect Technique (SIT) technique stands out, which consists of introducing sterile males into the mosquito population. This article presents reproduction analyzes of a population of natural mosquitoes compared to a population of mosquitoes with the insertion of males sterilized by ionizing radiation, seeking to observe the impact caused by this control method. The statistical analyzes showed the Negative Binomial regression model presented a better fit to the daily egg count data, when this model was compared to the Poisson model. In addition, the introduction of irradiated males decreases the average oviposition rate by approximately 30%.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140691763","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}

引用次数: 0

Modeling of the mass attenuation coefficients of X ray beams using deep neural networks (DNN) and NIST database 利用深度神经网络 (DNN) 和 NIST 数据库建立 X 射线光束质量衰减系数模型

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-17 DOI: 10.15392/2319-0612.2023.2201

Gustavo BERNARDES DA SILVA, Viviane RODRIGUES BOTELHO, Carla Diniz Lopes Becker, Cassiana Viccari, Thatiane A. Pianoschi

{"title":"Modeling of the mass attenuation coefficients of X ray beams using deep neural networks (DNN) and NIST database","authors":"Gustavo BERNARDES DA SILVA, Viviane RODRIGUES BOTELHO, Carla Diniz Lopes Becker, Cassiana Viccari, Thatiane A. Pianoschi","doi":"10.15392/2319-0612.2023.2201","DOIUrl":"https://doi.org/10.15392/2319-0612.2023.2201","url":null,"abstract":"Attenuation coefficients are essential physical parameters for many applications, such as the calculation of photon penetration and energy deposition to evaluate biological shielding. Estimating these parameters is complex, making it necessary to apply more sophisticated methodologies. The objective of the present study was to propose a model for estimating the attenuation coefficients using artificial neural networks. The NIST database was used to estimate the attenuation coefficients in terms of energy and atomic number from a regression problem using two approaches: the proposition of an automated model using the framework Talos and a manual model using Keras. The characteristics of the best model proposed in Talos were applied in manual training via Keras with cross-validation to evaluate the learning curves. The following were also assessed: the comparison of the curves of the attenuation coefficients predicted by the model compared with the reference data and the general comparison of the vectors X and y of the two models discussed. The Talos framework reference model obtained the following values of Loss and MSE error metric: 0.13 and 0.037, respectively. The best model of the manual approach received the following results: 0.19 and 0.08 for the loss function and MSE error metric, respectively. The absolute percentage error (MAE) of the difference in the results between the two models was: 0.065 and 0.044 for the Loss and MSE metrics. Despite applying two distinct propositions, both models had the same difficulties in predicting discontinuities in the physical behavior associated with the attenuation coefficients.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"24 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140693831","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}

引用次数: 0

Enhancing radiation protection at Sirius: methodology and results of beamline training 加强天狼星的辐射防护：光束线培训的方法和结果

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-12 DOI: 10.15392/2319-0612.2023.2177

Ana Luísa Da Costa Vieira, Fernanda Do Nacimento Moura

引用次数: 0

Analysis of hydrogen control in a Small Modular Reactor during TLOFW severe accident TLOFW 严重事故期间小型模块化反应堆氢气控制分析

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-10 DOI: 10.15392/2319-0612.2024.2359

M. R. Gual, Marcos Coelho Maturana, Nathalia Nunes Araújo, Marcelo Ramos Martins

引用次数: 0

O uso da realidade virtual no desenvolvimento de um sistema colaborativo para simulação de segurança física em instalações nucleares 利用虚拟现实技术开发模拟核设施实体安全的协作系统

Brazilian Journal of Radiation Sciences Pub Date : 2024-04-03 DOI: 10.15392/2319-0612.2024.2356

A. G. N. Santo, A. A. Mol, D. M. Machado, E. R. Marins

{"title":"O uso da realidade virtual no desenvolvimento de um sistema colaborativo para simulação de segurança física em instalações nucleares","authors":"A. G. N. Santo, A. A. Mol, D. M. Machado, E. R. Marins","doi":"10.15392/2319-0612.2024.2356","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2356","url":null,"abstract":"In recent years, the importance of improving physical protection in nuclear facilities has been observed, mainly due to the increasing progress of the Brazilian nuclear program. Physical protection requires great attention and strategies that must be designed, tested and improved in order to maintain the physical integrity of the facilities and population. These strategies should be tested in exercises to see if the physical protection plan - PPP is in accordance with the actual conditions of the facility, such as: visibility of the borders and terrain, number and equipment of the team in charge of defense (security guards), detection equipment and access times of central security point agents to the places where suspicious activities have been detected. In this sense, this article aimed to develop a tool that allow the visualization and planning of action strategies in a virtual environment, aiming to improve security. A virtual model of the Instituto de Engenharia Nuclear (IEN) was created, with close representations of reality and the virtual characters can transit and interact in real time. Various situations that affect the visibility and detection of opponents, such as natural and artificial lighting, climatic phenomena, shadows and others can be simulated with a high degree of realism. In addition, the tool has a surveillance system through virtual cameras, enabling monitoring of the environment. Thus, this system will allow to simulate approach strategies, allowing an evaluation of the procedures performed, as well as assist in physical protection training in radioactive and nuclear facilities.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"250 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140746079","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}

引用次数: 0

Maxwell Spectrum as a Parameter to Verify the Dose in Brain Cancer (Glioblastoma) by Boron Neutron Capture Therapy (BNCT) using Monte Carlo Method 使用蒙特卡洛方法将麦克斯韦光谱作为硼中子俘获疗法（BNCT）验证脑癌（胶质母细胞瘤）剂量的参数

Brazilian Journal of Radiation Sciences Pub Date : 2024-03-27 DOI: 10.15392/2319-0612.2024.2387

Carlo Method Haubrich, O. Medeiros, M. P. C. D’Oliveira, Monte Carlo

{"title":"Maxwell Spectrum as a Parameter to Verify the Dose in Brain Cancer (Glioblastoma) by Boron Neutron Capture Therapy (BNCT) using Monte Carlo Method","authors":"Carlo Method Haubrich, O. Medeiros, M. P. C. D’Oliveira, Monte Carlo","doi":"10.15392/2319-0612.2024.2387","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2387","url":null,"abstract":"To evaluate the efficiency of neutron capture therapy (BNCT) treatment in glioblastoma multiforme, it is necessary to evaluate the impact of the neutron beam on the tumor cell and find better results so that BNCT treatment is viable. Glioblastoma multiforme is one of the most lethal cancers and conventional radiotherapy is almost ineffective for this type of tumor. Among several approaches to describe the procedure and the neutron spectrum, the Maxwell spectrum in the epithermal neutron range was used. For this, T=0.0025 MeV was used to describe this spectrum. MCNP software was used to simulate a BNCT treatment using the Maxwell spectrum to describe the neutron source. The user provided the quantities of interest, such as fluence and dose. These are extremely important quantities to describe a BNCT planning protocol. A concentration of 30 ppm of Boron-10 was simulated in the tumor. Output data provides normalized values. It was necessary to carry out some mathematical operations to obtain values closer to reality. Thus, a dose of 32 Gy was obtained for the Maxwell spectrum described with T=0.0025 MeV and a neutron fluence of 1.5 x 1012 n/cm². The values calculated based on the simulation in MCNP5 described by an epithermal neutron source obeying a Maxwellian function, were in agreement with the reference values in the literature.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"8 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140374874","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}

引用次数: 0