• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >DOS 1 neutron dosimetry experiment at the HB-4-A key 7 surveillance site on the HFIR pressure vessel
【24h】

DOS 1 neutron dosimetry experiment at the HB-4-A key 7 surveillance site on the HFIR pressure vessel

机译：在HFIR压力容器上的HB-4-a关键7监测点进行DOs 1中子剂量测定实验

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A comprehensive neutron dosimetry experiment was made at one of the prime surveillance sites at the High Flux Isotope Reactor (HFIR) pressure vessel to aid radiation embrittlement studies of the vessel and to benchmark neutron transport calculations. The thermal neutron flux at the key 7, position 5 site was found, from measurements of radioactivation of four cobalt wires and four silver wires, to be 2.4 (times) 10(sup 12) n(center dot)m(sup (minus)2)(center dot)s(sup (minus)1). The thermal flux derived from two helium accumulation monitors was 2.3 (times) 10(sup 12) n(center dot)m(sup (minus)2)(center dot)(sup (minus)1). The thermal flux estimated by neutron transport calculations was 3.7 (times) 10(sup 12) n(center dot)m(sup (minus)2)s(sup (minus)1). The fast flux, >1 MeV, determined from two nickel activation wires, was 1.5 (times) 10(sup 12) n(center dot)m(sup (minus)2)(center dot)s(sup (minus)1), in keeping with values obtained earlier from stainless steel surveillance monitors and with a computed value of 1.2 (times) 10(sup 13) n(center dot)m(sup (minus)2)(center dot)(sup (minus)1). The fast fluxes given by two reaction-product-type monitors, neptunium-237 and beryllium, were 2.6 (times) 10(sup 13) n(center dot)m(sup (minus)2)(center dot)s (sup (minus)1) and 2.2 (times) 10(sup 13) n(center dot)m(sup (minus)2)s(sup (minus)1), respectively. Follow-up experiments indicate that these latter high values of fast flux are reproducible but are false; they are due to the creation of greater levels of reaction products by photonuclear events induced by an exceptionally high ratio of gamma flux to fast neutron flux at the vessel.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号