Terrestrial thermal neutrons

被引：37

作者：

Dirk, JD ^{[1
]}

Nelson, ME

Ziegler, JF

Thompson, A

Zabel, TH

机构：

[1] USN Acad, Dept Mech Engn, Annapolis, MD 21402 USA

[2] USN Acad, Dept Elect & Comp Engn, Annapolis, MD 21402 USA

[3] NIST, Gaithersburg, MD 20899 USA

[4] IBM Res Corp, Yorktown Hts, NY 10598 USA

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 2003年 / 50卷 / 06期

关键词：

ambient neutron flux; BPSG; electronic reliability; sea level cosmic rays; sea level neutrons; soft errors; thermal neutrons;

D O I：

10.1109/TNS.2003.821587

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The first NIST-traceable measurements of environmental thermal neutrons have been completed The average sea level flux of thermal neutrons is 4 cm(2)/hr. This flux changes less than two times over wide varieties of terrain, in all weather conditions and over the solar year. The neutron flux is normalized to 39N-76.5W. This flux scales with geomagnetic Lat/Long and with altitude in a manner similar to the flux of incident energetic cosmic rays. The shielded flux has been measured under 450 g/cm(2), with a residual flux of 0.1 times the sea-level value. Preliminary shielding studies inside buildings and under water shows significant variability in the thermal neutron mean attenuation coefficient.

引用

页码：2060 / 2064

页数：5