Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (03): 30203-030203.doi: 10.11889/j.0253-3219.2014.hjs.37.030203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Investigation of plasma stealth excited by 90Sr/90Y

ZHU Jiazhu1 LIU Wei1 CUI Chi1 WANG Xiang1 HUANG Yu’an2 ZHANG Ruili1 TANG Tao1 HUANG Runsheng1   

  1. 1(School of Physics, Nanjing University, Nanjing 210093, China) 2(School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China)
  • Received:2013-11-26 Revised:2013-12-24 Online:2014-03-10 Published:2014-03-14

Abstract:

Background: Plasma stealth is one of the most important branches of the electromagnetic stealth technology. ?-ray could ionize the air and excite the plasma. Under certain conditions, the plasma has stealth effect to the radar wave. Purpose: The aim is mainly to investigate the plasma stealth excited by 90Sr/90Y. Methods: We calculated the density distribution of the plasma excited by 90Sr/90Y with different radioactivity through configuring the weighting factor based on the decay energy spectrum of 90Sr/90Y with the electron diffusion and recombination in the air taken into consideration, and obtained the reflectivity of the plasma that was excited by infinite metal plate coated with 90Sr/90Y to electromagnetic waves with different incident angles and frequencies using the WKB (Wentzel-Kramers-Brillouin) method. Results: The reflectivity of the plasma with the radioactivity being 3.7×1010Bq?cm?2 and 3.7×1011Bq?cm?2 to the vertically incident electromagnetic wave of 1.5 GHz could reach ?2.2dB and ?7.45dB respectively. Conclusion: In the range of 1–100GHz, the reflectivity increases monotonically with the frequency, while decreases monotonically with the increase of incident angle. The stealth effect of the plasma excited by 90Sr/90Y with a certain radioactivity is of significance.

Key words: Plasma, Electron density, Reflectivity, Stealth technology, Radioactively exciting