The neutron-induced total cross-section of ^(209)Bi is crucial for the physical design and safety assessment of lead-based fast reactors, and the quality of experimental data should be improved for evaluation and appl...The neutron-induced total cross-section of ^(209)Bi is crucial for the physical design and safety assessment of lead-based fast reactors, and the quality of experimental data should be improved for evaluation and application.A recent experiment was conducted on the back-streaming white neutron beamline(Back-n) at the China Spallation Neutron Source(CSNS) using the neutron total cross-section spectrometer(NTOX). The neutron energy was determined using a fast multi-cell fission chamber and the time-of-flight technique. Two high-purity bismuth samples,6 mm and 20 mm in thickness, were chosen for neutron transmission measurements and comparisons. The neutron total cross-sections of ^(209)Bi, ranging from 0.3 e V to 20 Me V, were derived considering neutron flight time determination, flight path calibration, and background subtraction. A comparison of the experimental results with the data in the ENDF/B-VⅢ.0 library showed fair agreement, and the point-wise cross-sections were found to be consistent with existing experimental data. Special attention was given to the determination of resonance parameters, which were analyzed using the R-matrix code SAMMY and Bayesian method in the 0.5 ke V to 20 ke V energy range. The extracted resonance parameters were compared to previously reported results and evaluated data. This study is recognized as the first one where the neutron total cross-section of bismuth across such a broad energy spectrum is measured in a single measurement or experiment, and it provides valuable data for the assessment of related reaction information for evaluated libraries and the advancement of lead-bismuth-based nuclear systems.展开更多
The present report describes a case of hemobilia caused by hepatic pseudoaneurysm. A 63-year-old woman was admitted with abdominal pain and mild jaundice. She was diagnosed as choledocholithiasis and hypersplenism and...The present report describes a case of hemobilia caused by hepatic pseudoaneurysm. A 63-year-old woman was admitted with abdominal pain and mild jaundice. She was diagnosed as choledocholithiasis and hypersplenism and underwent choledocolithotomy and splenectomy. 9th day post operation, massive fresh blood suddenly flew out from T tube and she underwent emergency abdominal exploration but there were no obvious bleeding sites in the abdominal cavity and no bleeding sites in the biliary tree by choledochoscope. 7th day after the second operation, fresh blood suddenly flew out from T tube again and angiography showed two small peudoaneurysms at the second branch of right hepatic artery which might result in hemobilia. The hemobilia was treated successfully with coil embolisation of peudoaneurysms and she recovers fully.展开更多
基金the National Natural Science Foundation of China(12375296)the Key Laboratory of Nuclear Data Foundation(JCKY2022201C153)+1 种基金the National Key Research and Development Plan(2022YFA1603303)the Natural Science Foundation of Hunan Province of China(2021JJ40444,2020RC3054)。
文摘The neutron-induced total cross-section of ^(209)Bi is crucial for the physical design and safety assessment of lead-based fast reactors, and the quality of experimental data should be improved for evaluation and application.A recent experiment was conducted on the back-streaming white neutron beamline(Back-n) at the China Spallation Neutron Source(CSNS) using the neutron total cross-section spectrometer(NTOX). The neutron energy was determined using a fast multi-cell fission chamber and the time-of-flight technique. Two high-purity bismuth samples,6 mm and 20 mm in thickness, were chosen for neutron transmission measurements and comparisons. The neutron total cross-sections of ^(209)Bi, ranging from 0.3 e V to 20 Me V, were derived considering neutron flight time determination, flight path calibration, and background subtraction. A comparison of the experimental results with the data in the ENDF/B-VⅢ.0 library showed fair agreement, and the point-wise cross-sections were found to be consistent with existing experimental data. Special attention was given to the determination of resonance parameters, which were analyzed using the R-matrix code SAMMY and Bayesian method in the 0.5 ke V to 20 ke V energy range. The extracted resonance parameters were compared to previously reported results and evaluated data. This study is recognized as the first one where the neutron total cross-section of bismuth across such a broad energy spectrum is measured in a single measurement or experiment, and it provides valuable data for the assessment of related reaction information for evaluated libraries and the advancement of lead-bismuth-based nuclear systems.
文摘The present report describes a case of hemobilia caused by hepatic pseudoaneurysm. A 63-year-old woman was admitted with abdominal pain and mild jaundice. She was diagnosed as choledocholithiasis and hypersplenism and underwent choledocolithotomy and splenectomy. 9th day post operation, massive fresh blood suddenly flew out from T tube and she underwent emergency abdominal exploration but there were no obvious bleeding sites in the abdominal cavity and no bleeding sites in the biliary tree by choledochoscope. 7th day after the second operation, fresh blood suddenly flew out from T tube again and angiography showed two small peudoaneurysms at the second branch of right hepatic artery which might result in hemobilia. The hemobilia was treated successfully with coil embolisation of peudoaneurysms and she recovers fully.
