{"title":"NB-CTMFD 探测器与 Ludlum 42-49B 和 Fuji NSN3 探测器在铅/混凝土屏蔽配置内用于硬(Am-Be)和软(Cf-252 裂变)能谱中子源时的性能比较","authors":"Yusuke Ota, S. Ozerov, R. Taleyarkhan","doi":"10.1115/1.4065852","DOIUrl":null,"url":null,"abstract":"This paper presents results of neutron detection efficiency and dosimetry between a non-borated centrifugally tensioned metastable fluid detector (NB-CTMFD) configured to detect fast (>0.1 MeV) vs. He-3 based Ludlum-42-49B and the Fuji NSN3, detectors behind various levels of lead and concrete shieldin-together with MCNP code simulations to account for 3-D effects and to relate the detection sensitivity with the dose rate. The MCNP results for neutron energy spectra were validated vs. experimental measurements using the H*TMFD. While Ludlum and NSN3 operate at a fixed sensitivity, the NB-CTMFD detector offers variable sensitivity by varying the tensioned metastable negative pressure (Pneg) from 0.3 MPa to 0.7 MPa. The NB-CTMFD (configured for fast: > 0.2 MeV neutron detection) offered relative sensitivity enhancements of up to 15x greater than the Ludlum and ~5x greater than the NSN3 detector for low shielding thicknesses. For larger thicknesses, the advantage factor for NB-CTMFD unit reduces with increased fast neutron removal via down-scattering, which benefits the Ludlum and NSN3 detectors. Our companion paper compares performance with a Cf-252 spectrum using a borated CTMFD (covering dual energy bins: thermal-epithermal and fast energy ranges) wherein, it is demonstrated that the advantage factor for the CTMFD (if borated) remains elevated at the 5-10x higher level for low and large shielding thicknesses and soft and hard neutron spectra.","PeriodicalId":16756,"journal":{"name":"Journal of Nuclear Engineering and Radiation Science","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Performance of NB-CTMFD detector vs Ludlum 42-49B, and Fuji NSN3 detectors for hard (Am-Be) and soft (Cf-252 fission) energy spectra neutron sources within lead/concrete shielded configurations\",\"authors\":\"Yusuke Ota, S. Ozerov, R. Taleyarkhan\",\"doi\":\"10.1115/1.4065852\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This paper presents results of neutron detection efficiency and dosimetry between a non-borated centrifugally tensioned metastable fluid detector (NB-CTMFD) configured to detect fast (>0.1 MeV) vs. He-3 based Ludlum-42-49B and the Fuji NSN3, detectors behind various levels of lead and concrete shieldin-together with MCNP code simulations to account for 3-D effects and to relate the detection sensitivity with the dose rate. The MCNP results for neutron energy spectra were validated vs. experimental measurements using the H*TMFD. While Ludlum and NSN3 operate at a fixed sensitivity, the NB-CTMFD detector offers variable sensitivity by varying the tensioned metastable negative pressure (Pneg) from 0.3 MPa to 0.7 MPa. The NB-CTMFD (configured for fast: > 0.2 MeV neutron detection) offered relative sensitivity enhancements of up to 15x greater than the Ludlum and ~5x greater than the NSN3 detector for low shielding thicknesses. For larger thicknesses, the advantage factor for NB-CTMFD unit reduces with increased fast neutron removal via down-scattering, which benefits the Ludlum and NSN3 detectors. Our companion paper compares performance with a Cf-252 spectrum using a borated CTMFD (covering dual energy bins: thermal-epithermal and fast energy ranges) wherein, it is demonstrated that the advantage factor for the CTMFD (if borated) remains elevated at the 5-10x higher level for low and large shielding thicknesses and soft and hard neutron spectra.\",\"PeriodicalId\":16756,\"journal\":{\"name\":\"Journal of Nuclear Engineering and Radiation Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Nuclear Engineering and Radiation Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1115/1.4065852\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"NUCLEAR SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Nuclear Engineering and Radiation Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/1.4065852","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Performance of NB-CTMFD detector vs Ludlum 42-49B, and Fuji NSN3 detectors for hard (Am-Be) and soft (Cf-252 fission) energy spectra neutron sources within lead/concrete shielded configurations
This paper presents results of neutron detection efficiency and dosimetry between a non-borated centrifugally tensioned metastable fluid detector (NB-CTMFD) configured to detect fast (>0.1 MeV) vs. He-3 based Ludlum-42-49B and the Fuji NSN3, detectors behind various levels of lead and concrete shieldin-together with MCNP code simulations to account for 3-D effects and to relate the detection sensitivity with the dose rate. The MCNP results for neutron energy spectra were validated vs. experimental measurements using the H*TMFD. While Ludlum and NSN3 operate at a fixed sensitivity, the NB-CTMFD detector offers variable sensitivity by varying the tensioned metastable negative pressure (Pneg) from 0.3 MPa to 0.7 MPa. The NB-CTMFD (configured for fast: > 0.2 MeV neutron detection) offered relative sensitivity enhancements of up to 15x greater than the Ludlum and ~5x greater than the NSN3 detector for low shielding thicknesses. For larger thicknesses, the advantage factor for NB-CTMFD unit reduces with increased fast neutron removal via down-scattering, which benefits the Ludlum and NSN3 detectors. Our companion paper compares performance with a Cf-252 spectrum using a borated CTMFD (covering dual energy bins: thermal-epithermal and fast energy ranges) wherein, it is demonstrated that the advantage factor for the CTMFD (if borated) remains elevated at the 5-10x higher level for low and large shielding thicknesses and soft and hard neutron spectra.
期刊介绍:
The Journal of Nuclear Engineering and Radiation Science is ASME’s latest title within the energy sector. The publication is for specialists in the nuclear/power engineering areas of industry, academia, and government.