Applied Radiation and Isotopes最新文献_第7页

A carbon/oxygen calculation method to improve the response sensitivity of carbon/oxygen logging 提高碳/氧测井反应灵敏度的碳/氧计算方法。

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-09-04 DOI: 10.1016/j.apradiso.2024.111499

{"title":"A carbon/oxygen calculation method to improve the response sensitivity of carbon/oxygen logging","authors":"","doi":"10.1016/j.apradiso.2024.111499","DOIUrl":"10.1016/j.apradiso.2024.111499","url":null,"abstract":"<div><p>Carbon/Oxygen logging is an effective method to perform oil layer recognition and oil saturation calculation, which plays an important role in the evaluation of remaining oil after casing. At present, there are two main methods to calculate the ratio of carbon to oxygen (C/O). Compared with the energy window count method, the element yield method can avoid the influence of background count in the gamma spectrum and calculated carbon/oxygen value has the higher sensitivity and better accuracy, but it is still greatly affected by carbon and oxygen elements in the formation skeleton. Therefore, a new carbon/oxygen calculation method is proposed in this paper to overcome the influence of formation skeleton and improve the response sensitivity of Carbon/Oxygen logging. Based on Monte Carlo method, the inelastic gamma spectrum of pure sandstone and pure limestone skeletons are obtained. Based on spectrum analysis technology, the ratio relationship of carbon, oxygen yield and skeleton mark element (Si, Ca) yield in two skeletons are obtained. Using these ratio relationships, the carbon and oxygen yields from the sandstone and limestone reservoir skeletons are deducted from the total carbon and oxygen yield. A new carbon/oxygen parameter called the residual carbon/oxygen value (C/O)<sub>R</sub> is calculated to perform oil-water recognition and a set of oil saturation calculation model suitable for the residual carbon/oxygen value is proposed. The environment application of the residual carbon/oxygen value is also analyzed. The study shows that the residual carbon/oxygen value has higher sensitivity than original carbon/oxygen value in oil layer recognition and has a great accuracy in oil saturation calculation. In environment application aspect, the residual carbon/oxygen value is basically unaffected by formation water salinity and is affected by wellbore fluid and wellbore size obviously. This new carbon/oxygen value calculation method has an important significance to improve the application effect of Carbon/Oxygen logging.</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142144899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thoron exposure in the radon-thoron prone area of the Adamawa Region, Cameroon 喀麦隆阿达马瓦大区氡气多发区的氡接触情况。

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-09-03 DOI: 10.1016/j.apradiso.2024.111498

引用次数: 0

Experimental study for the decontamination of various surfaces from 99Mo using PVA/Borax/Al(OH)3 strippable hydrogel 使用 PVA/Borax/Al(OH)3 可剥离水凝胶消除各种表面 99Mo 污染的实验研究

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-30 DOI: 10.1016/j.apradiso.2024.111493

引用次数: 0

First production of pure 155Gd targets and 155Gd(p,x)155Tb, 156Tb cross-section measurements 首次生产纯 155Gd 靶件并测量 155Gd(p,x)155Tb、156Tb 横截面

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-27 DOI: 10.1016/j.apradiso.2024.111485

引用次数: 0

Activation cross sections of alpha-particle-induced reactions on natural rhenium up to 50 MeV 天然铼上阿尔法粒子诱导反应的活化截面（50MeV以下

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-27 DOI: 10.1016/j.apradiso.2024.111486

引用次数: 0

Direct radiolabeling of Folate with Tc-99m using QbD approach: A step closer to folate based diagnostic agent 利用 QbD 方法用锝-99m 直接放射性标记叶酸：向叶酸诊断试剂迈进了一步

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-27 DOI: 10.1016/j.apradiso.2024.111484

{"title":"Direct radiolabeling of Folate with Tc-99m using QbD approach: A step closer to folate based diagnostic agent","authors":"","doi":"10.1016/j.apradiso.2024.111484","DOIUrl":"10.1016/j.apradiso.2024.111484","url":null,"abstract":"<div><p>The aim of the presented work was to develop folate based radiolabeled compound intended to be used as diagnostic aid for the various folate-receptor overexpressing cancers eg. breast cancer, brain tumors, lung cancer etc. Folate was directly radiolabeled with Tc-99m using Quality-by-Design and encapsulated in micellar nanocarriers. The authors are of the view that the stable radiolabeled folate could be of potential diagnostic value in cancers overexpressing folate receptors thereby opening novel possibilities to diagnostic applications of radiolabeled folate.</p></div><div><h3>Summary for technical notes</h3><p>Folic acid was directly radiolabeled with Tc-99m utilizing a quality by design approach. The experimental trials were designed using the Box-Behenken design with the concentration of drug, concentration of reducing agent and the incubation time as dependent variable and percent radiolabeling as the response for the same. The applied design in the method section was validated with a series of experiments and the percent labeling of the FA with Tc-99m was found to be around 94%. The radiolabeled compound was imperilled to stability evaluation by incubating the same with serum and physiological pH and the same was found to be stable at the end of 4h. On subjecting to DTPA challenge test, the compound displayed no change in the radiolabeling percentage thereby indicating the robustness of the formed Tc-99m-FA complex, The radiolabeled Tc-99m-FA was further encapsulated into micellar nanocarriers and the same were also found to be robust and stable.</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the effect of gliding discharge plasma on polystyrene and Polyamide6 by positron annihilation lifetime spectroscopy 利用正电子湮灭寿命光谱学研究滑行放电等离子体对聚苯乙烯和聚酰胺 6 的影响

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-26 DOI: 10.1016/j.apradiso.2024.111482

{"title":"Investigating the effect of gliding discharge plasma on polystyrene and Polyamide6 by positron annihilation lifetime spectroscopy","authors":"","doi":"10.1016/j.apradiso.2024.111482","DOIUrl":"10.1016/j.apradiso.2024.111482","url":null,"abstract":"<div><p>Polymers are widely used today and the changes in their properties are investigated by different methods such as plasma irradiation. One of the most important methods for modifying polymers is cold plasma, by which the surface properties of the polymers can be changed under atmospheric pressure. In this study, the effect of plasma on Polystyrene (PS) and Polyamide 6 (PA6) samples was investigated. Surface and depth changes of the PS and PA6 have been investigated by various experimental techniques such as Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Contact Angle (CA), and Positron Annihilation Lifetime Spectroscopy (PALS). The results of Attenuated Total Reflectance (ATR)-FTIR show that the chemical bonds of PA6 have been changed, and preserved in PS in the depths. The XRD results show that there are no volume changes for chemical bands. The FESEM analysis results reveal that the plasma causes digging and creates roughness on the surface. The CA measurement confirms the FESEM results and points out an increase in hydrophobicity after plasma processing. The PALS results indicate that the free volumes of the matter are changed after plasma irradiation in the depths of PS and PA6. In addition, the plasma also causes changes in the micrometer depth.</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization and shielding design of a thermal neutron device based on D-D neutron generator with Geant4 toolkit 利用 Geant4 工具包对基于 D-D 中子发生器的热中子装置进行优化和屏蔽设计

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-26 DOI: 10.1016/j.apradiso.2024.111483

{"title":"Optimization and shielding design of a thermal neutron device based on D-D neutron generator with Geant4 toolkit","authors":"","doi":"10.1016/j.apradiso.2024.111483","DOIUrl":"10.1016/j.apradiso.2024.111483","url":null,"abstract":"<div><p>Neutron activation analysis is a highly sensitive non-destructive testing technique with important applications in industry, geoscience, medical therapy, etc. This work designed and optimized a thermal neutron device that utilized a portable D-D neutron generator, and the Monte Carlo method with the Geant4 toolkit was applied to simulation. The objective of the optimized design is to maximize the thermal neutron flux at the output surface and increase the utilization efficiency of the neutron generator. A parameter K was defined as a measure of the device's slowing capacity for neutrons and was used to determine the optimized device geometry. The simulation considered the contribution of different types and sizes of moderators and reflectors to the thermal neutron intensity to obtain the optimal size. The shielding protection of the device was then designed. The effectiveness of shielding with different thicknesses was evaluated using three dose reference points. The results indicated that the optimized device can achieve a maximum thermal neutron flux of 1.97 × 10<sup>5</sup> n∙cm<sup>−2</sup>∙s<sup>−1</sup> at the output surface by using high-density polyethylene (HDPE) as the moderator and nickel as the reflector. It was determined that using 45 cm of HDPE and 9 cm of lead protection in sequence along the neutron head axis would reduce the dose rate at the reference point, located 5 cm from the surface of the device, below the safety limit of 2.5 μSv/h.</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142088864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved air kerma determination in the radiation field of the X-ray tube used in medical imaging systems, considering the type and thickness of the filter 考虑到过滤器的类型和厚度，改进了医疗成像系统所用 X 射线管辐射场中的空气动量测定方法

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-23 DOI: 10.1016/j.apradiso.2024.111481

{"title":"Improved air kerma determination in the radiation field of the X-ray tube used in medical imaging systems, considering the type and thickness of the filter","authors":"","doi":"10.1016/j.apradiso.2024.111481","DOIUrl":"10.1016/j.apradiso.2024.111481","url":null,"abstract":"<div><p>In diagnostic radiology, the air kerma is an essential parameter. Radiologists consider the air kerma, when calculating organ doses and dangers to patients. The intensity of the radiation beam is represented by the air kerma, which is the value of energy wasted by a photon as it travels through air. Because of the heel effect in X-ray sources, air kerma varies throughout the field of medical imaging systems. One possible contributor to this discrepancy is the X-ray tube's voltage. In this study, an approach has been proposed for predicting the air kerma anywhere inside the field of X-ray beams utilized in medical diagnostic imaging systems. As a first step, a diagnostic imaging system was modelled using the Monte Carlo N-Particle platform. We used a tungsten target and aluminum and beryllium filters of varying thicknesses to recreate the X-ray tube. The air kerma has been measured in different parts of the conical X-ray beam that is working at 30, 50, 70, 90, 110, 130, and 150 kV. This gives enough data for training neural networks. The voltage of the X-ray tube, filter type, filter thickness, and the coordinates of each point used to calculate the air kerma were all inputs to the MLP neural network. The MLP architecture, known for its significant advancements in research and expanding applications, was trained to predict the quantity of air kerma as its output. Specifically, by considering X-ray tube filters of varying thicknesses, the trained MLP model demonstrated its capability to accurately predict the air kerma at every point within the X-ray field for a range of X-ray tube voltages typically used in medical diagnostic radiography (30–150 kV).</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel method of identification of in-ring decay and its application in the half-life estimates of 94mRu44+ 识别环内衰变的新方法及其在 94mRu44+ 半衰期估算中的应用

IF 1.6 3区工程技术

Applied Radiation and Isotopes Pub Date : 2024-08-22 DOI: 10.1016/j.apradiso.2024.111480

{"title":"A novel method of identification of in-ring decay and its application in the half-life estimates of 94mRu44+","authors":"","doi":"10.1016/j.apradiso.2024.111480","DOIUrl":"10.1016/j.apradiso.2024.111480","url":null,"abstract":"<div><p>Isochronous Mass Spectrometry is a practical approach for studying decays of short-lived isomers. However, solely relying on the time stamps between the isomer and ground state does not provide clear sign of decay. To address this issue, we proposed a method for extracting decay time point by analyzing the residuals of time stamps within a window of (<span><math><mrow><mn>20</mn><mspace></mspace><mi>μ</mi><mi>s</mi></mrow></math></span>, <span><math><mrow><mn>180</mn><mspace></mspace><mi>μ</mi><mi>s</mi></mrow></math></span>) after the start of data acquisition. Decay events out of the window were disregarded due to poor accuracy of revolution time. In this paper, we propose a novel approach based on the discrete Fourier transform technique, which was tested by simulation data. We found that the accuracy of the decay time point can be improved, leading to an expanded window of (<span><math><mrow><mn>15</mn><mspace></mspace><mi>μ</mi><mi>s</mi></mrow></math></span>, <span><math><mrow><mn>185</mn><mspace></mspace><mi>μ</mi><mi>s</mi></mrow></math></span>). Furthermore, as the novel method was applied to experimental data, additional five decay events were identified. The newly determined half-life of <span><math><msup><mrow></mrow><mrow><mn>94</mn><mi>m</mi></mrow></msup></math></span>Ru<span><math><msup><mrow></mrow><mrow><mn>44</mn><mo>+</mo></mrow></msup></math></span> is consistent with the previous value.</p></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142083924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0