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<p>Gamma-ray detectors with insufficient energy resolution can misidentify naturally occurring radionuclides (NORM, such as <sup>214</sup>Bi and <sup>228</sup>Ac) as <sup>137</sup>Cs and <sup>134</sup>Cs. Since 2011, CsI(Tl) or NaI(Tl) scintillation detectors have been employed for screening radiocesium in the vicinity of the Fukushima Daiichi Nuclear Power Plant. However, these detectors are unable to reliably discriminate between NORM and radiocesium, which could result in false reports of the presence of radiocesium (Type 1 error).</p>

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Misidentification of natural and anthropogenic radionuclides in scintillation-based screening in Fukushima, Japan

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Katsumi Shozugawa,
  • Mayumi Hori,
  • Tsutomu Takizawa,
  • Johnson E. Thomas

摘要

Gamma-ray detectors with insufficient energy resolution can misidentify naturally occurring radionuclides (NORM, such as 214Bi and 228Ac) as 137Cs and 134Cs. Since 2011, CsI(Tl) or NaI(Tl) scintillation detectors have been employed for screening radiocesium in the vicinity of the Fukushima Daiichi Nuclear Power Plant. However, these detectors are unable to reliably discriminate between NORM and radiocesium, which could result in false reports of the presence of radiocesium (Type 1 error).