Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan.

@article{Chang2001Unusual2A,
  title={Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan.},
  author={W P Chang and Yuriy B Nabyvanets and Min Huan Jen},
  journal={Health physics},
  year={2001},
  volume={80 6},
  pages={602-4}
}
At least eight bustling streets or approximately 3-5% of all the road surface of civilian utility in the downtown area of Taoyuan City, Taiwan, were inadvertently found to contain unusual levels of radioactivity during a routine environmental radiation surveillance in mid-1994. Crushed rock debris and coarse sands separated from the asphalt pavement were identified to be the source of excessive radioactivity. By employing gamma spectrometry, we have measured 232Th activity (via 228Ac) and mU… CONTINUE READING

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