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EARLY DETECTION OF RADIOACTIVE FALLOUT BY GAMMA SPECTROMETRY

机译:伽玛谱法早期检测放射性辐射

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摘要

Radioactive fallout should be detected as early as possible. A new and efficient method for detection of low-level irradiation from manmade radioactivity is developed. Radiation abnormalities are detectable down to air kerma rates of 0.5 to 1.0 nGy h~(-1) for ~(137)Cs and even lower for ~(131)I. For multi-gamma energy radioactivity the detection level is 2.6-3.5 nGy h~(-1). A standard NaI detector and a 512-channel analyser are used together with noise adjusted singular value decomposition (NASVD). Statistical noise is removed and the measured spectra are reproduced using spectral components produced by NASVD. Stripping is not used and false alarms due to washout of atmospheric radon progeny are almost eliminated. Detection levels and the criteria for setting warning and alarm levels are discussed. The method may also be useful in other situations, for example where low-level signals from radioactive sources need to be detected.
机译:应尽早发现放射性尘埃。开发了一种从人为放射性中检测低水平辐射的新有效方法。对于〜(137)Cs,辐射异常可检测到空气比释动能速率低至0.5至1.0 nGy h〜(-1),对于〜(131)I甚至更低。对于多伽马能量放射性,检测水平为2.6-3.5 nGy h〜(-1)。标准的NaI检测器和512通道分析仪与噪声调整后的奇异值分解(NASVD)一起使用。去除统计噪声,并使用NASVD产生的光谱分量再现测量的光谱。不使用剥离,几乎消除了由于大气ra子的冲刷而引起的误报。讨论了检测级别以及设置警告和警报级别的标准。该方法在其他情况下也可能有用,例如需要检测来自放射源的低电平信号。

著录项

  • 来源
    《Radiation Protection Dosimetry》 |2003年第2期|p.155-164|共10页
  • 作者单位

    Measurement and Instrumentation Systems, Orsted·DTU, Building 327 Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TL72;
  • 关键词

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