Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-06-27
Abstract： [Background]Active neutron interrogation (ANI) measurement systems can quantify the fissile mass of special nuclear materials (SNMs) using neutrons and are widely used in nuclear safeguard fields. However, the hydrogen-containing matrix in the waste drum reduces the signal of delayed neutrons and limits the fissile mass measurement precision of the ANI system. [Purpose]It is essential to ensure that the fissile mass evaluation of the SNM is independent of matrix material and to improve the assay performance of the ANI system in nuclear safeguard measurements. [Methods] Therefore, based on the flux monitor response, a new matrix correction method was developed on the basis of traditional correction methods in this work. [Results]It turned out that the effect of various hydrogen densities on the delayed neutron count rate differs. For U3O8 materials with different enrichment and distribution, matrix effect may result in an overestimation of up to ~7 times in the observed mass of 235U. For U3O8 materials with different 235U enrichments and distribution states, both the traditional correction method and the new correction method can effectively reduce the influence of the matrix material on the measurement of SNM mass. But compared with the traditional method, the new method can achieve better correction results. For the case where U3O8 material is located in the center of the matrix, the average relative deviation of 235U mass obtained by the new correction method is 13.6%, while for the case where U3O8 material homogeneous dispersed throughout the matrix, the average relative deviation of 235U mass obtained by the new correction method is 7.78%. [Conclusions]These results confirm the effective performance and practicality of the new correction method.
Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-06-13
Abstract： [Background]Active neutron interrogation (ANI) measurement systems can quantify the fissile mass of special nuclear materials (SNMs) using neutrons and are widely used in nuclear safeguard fields. However, the hydrogen-containing matrix in the waste drum reduces the signal of delayed neutrons and limits the fissile mass measurement precision of the ANI system. [Purpose]It is essential to ensure that the fissile mass evaluation of the SNM is independent of matrix material and to improve the assay performance of the ANI system in nuclear safeguard measurements. [Methods] Therefore, based on the flux monitor response, a new matrix correction method was developed on the basis of traditional correction methods in this work. [Results]It turned out that the effect of various hydrogen densities on the delayed neutron count rate differs. For U3O8 materials with different enrichment and distribution, matrix effect may result in an overestimation of up to ~7 times in the observed mass of 235U. For U3O8 materials with different 235U enrichments and distribution states, both the traditional correction method and the new correction method can effectively reduce the influence of the matrix material on the measurement of SNM mass. But compared with the traditional method, the new method can achieve better correction results. For the case where U3O8 material is located in the center of the matrix, the average relative deviation of 235U mass obtained by the new correction method is 13.6%, while for the case where U3O8 material homogeneous dispersed throughout the matrix, the average relative deviation of 235U mass obtained by the new correction method is 7.78%. [Conclusions]These results confirm the effective performance and practicality of the new correction method.
Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-05-15
Abstract： [Background]Active neutron interrogation (ANI) measurement systems can quantify the fissile mass of special nuclear materials (SNMs) using neutrons and are widely used in nuclear safeguard fields. However, the hydrogen-containing matrix in the waste drum reduces the signal of delayed neutrons and limits the fissile mass measurement precision of the ANI system. [Purpose]It is essential to ensure that the fissile mass evaluation of the SNM is independent of matrix material and to improve the assay performance of the ANI system in nuclear safeguard measurements. [Methods] Therefore, based on the flux monitor response, a new matrix correction method was developed on the basis of traditional correction methods in this work. [Results]It turned out that the effect of various hydrogen densities on the delayed neutron count rate differs. For U3O8 materials with different enrichment and distribution, matrix effect may result in an overestimation of up to ~7 times in the observed mass of 235U. For U3O8 materials with different 235U enrichments and distribution states, both the traditional correction method and the new correction method can effectively reduce the influence of the matrix material on the measurement of SNM mass. But compared with the traditional method, the new method can achieve better correction results. For the case where U3O8 material is located in the center of the matrix, the average relative deviation of 235U mass obtained by the new correction method is 13.6%, while for the case where U3O8 material homogeneous dispersed throughout the matrix, the average relative deviation of 235U mass obtained by the new correction method is 7.78%. [Conclusions]These results confirm the effective performance and practicality of the new correction method.
Subjects: Digital Publishing >> Internet Journals submitted time 2024-01-31
Abstract： Purpose This paper analyzed the differences of data publication policies of English journals of agricultural science at home and abroad,pointed out the problems of data publication policies of English journals of agricultural science at home,and put forward some data publications suggestions of English agricultural journals in China. Methods This paper analyzed the characteristics of data publication policies of English journals of agricultural science at home and abroad by network research,content analysis and case comparison. Findings The strength of the data policy of the most foreign agricultural journals is stronge,and these journals had detailed data submission and check standards,but both English journals of agricultural science at home and abroad should strengthen the management data publication copyright.The English agricultural journals in China should make the detailed data publication policies. Conclusions The agricultural journals in China should reinforce the awareness of data publication,study the experience of data publication of foreign agricultural journals,perfect the data publication details in order to promote the public sharing of agricultural scientific data.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：【目的】进一步优化我国科技期刊选题策划工作，提高科技期刊质量与影响力。【方法】文章利用VOSviewer可视化分析软件，以Web of Science核心合集作为数据来源，以我国热带农业核心期刊《热带作物学报》为分析样本，分析国外热带农业热门研究领域、主要发文机构、主要期刊等信息，并与《热带作物学报》研究领域作对比。【结果】提出利用VOSviewer可视化分析指导科技期刊选题策划、筛选优质专家资源、获取优质作者信息等建议。【结论】可视化分析技术为我国科技期刊选题策划工作提出了新的方法，期刊编辑应提高选题策划能力，利用可视化分析技术提高期刊选题策划质量，进而提高我国科技期刊质量与影响力。
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