Investigation of plasma stealth excited by 90Sr/90Y

ZHU Jiazhu; LIU Wei; CUI Chi; WANG Xiang; HUANG Yu’an; ZHANG Ruili; TANG Tao; HUANG Runsheng

doi:10.11889/j.0253-3219.2014.hjs.37.030203

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Investigation of plasma stealth excited by 90Sr/90Y

更新时间：2021-03-03

- Investigation of plasma stealth excited by 90Sr/90Y
- NUCLEAR TECHNIQUES Vol. 37, Issue 3, Article number: 030203(2014)
- 作者机构：
  
  1. 南京大学物理学院,南京,210093
  2. 南京工程学院材料工程学院,南京,211167
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.030203
  CLC：
- Published：14 March 2014
- 稿件说明：
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ZHU Jiazhu, LIU Wei, CUI Chi, et al. Investigation of plasma stealth excited by 90Sr/90Y[J]. Nuclear techniques, 2014, 37(3): 030203
DOI：

ZHU Jiazhu, LIU Wei, CUI Chi, et al. Investigation of plasma stealth excited by 90Sr/90Y[J]. Nuclear techniques, 2014, 37(3): 030203 DOI： 10.11889/j.0253-3219.2014.hjs.37.030203.

摘要

依据90Sr/90Y的?衰变电子能谱分布，并考虑空气中电子扩散与复合规律，计算出不同活度的放射源致空气电离的电子密度分布；再利用WKB (Wentzel-Kramers-Brillouin)方法计算了涂覆90Sr/90Y的无限大金属板激发等离子体对不同入射角度、不同频率电磁波的反射率。当放射源的活度为3.7×1010Bq?cm?2和3.7×1011Bq?cm?2时，对垂直入射的1.5GHz电磁波的反射率分别为?2.2 dB和 ?7.45 dB。在1–100GHz范围内，反射率随入射电磁波频率的上升单调上升，随入射角度的上升单调下降。

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.Cited

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